MR. SHU WING CHAN MD
Prescription History 1497828586
Internal Medicine in San Francisco, CA
What does Dr. Chan prescribe?
In 2024, Dr. Chan wrote 3,359 Medicare prescriptions for 54 medications. The most prescribed was Amlodipine Besylate, with 342 prescriptions for 99 patients.
Medicare Part D only. These are prescriptions filled by people with Medicare drug coverage in 2024, from the CMS data released in 2026, the most recent year available. CMS does not publish medications with fewer than 11 prescriptions, so this is not a full list of what Dr. Chan prescribes.
Medications 54 medications
Prescriptions filled under Medicare Part D in 2024. Select a medication to see what it is used for and how it compares with other California prescribers.
What it is used for
Amlodipine is used with or without other medications to treat high blood pressure.
Compared with California prescribers
Dr. Chan wrote 342 prescriptions for Amlodipine Besylate, about 2.4 times as often as the typical California prescriber of it (141). Medicare paid $4.02 per fill, versus $7.08 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Atorvastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with California prescribers
Dr. Chan wrote 340 prescriptions for Atorvastatin Calcium, about 1.7 times as often as the typical California prescriber of it (202). Medicare paid $5.80 per fill, versus $10.47 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with California prescribers
Dr. Chan wrote 326 prescriptions for Metoprolol Succinate, about 3.8 times as often as the typical California prescriber of it (86). Medicare paid $15.11 per fill, versus $14.23 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Losartan is used to treat high blood pressure (hypertension) and to help protect the kidneys from damage due to diabetes.
Compared with California prescribers
Dr. Chan wrote 275 prescriptions for Losartan Potassium, about 2.3 times as often as the typical California prescriber of it (121). Medicare paid $7.37 per fill, versus $10.35 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Apixaban is used to prevent serious blood clots from forming due to a certain irregular heartbeat (atrial fibrillation) or after hip/knee replacement surgery.
Compared with California prescribers
Dr. Chan wrote 165 prescriptions for Eliquis, about 2.3 times as often as the typical California prescriber of it (73). Medicare paid $1,241.80 per fill, versus $923.33 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Furosemide is used to reduce extra fluid in the body (edema) caused by conditions such as heart failure, liver disease, and kidney disease.
Compared with California prescribers
Dr. Chan wrote 142 prescriptions for Furosemide, about 2.2 times as often as the typical California prescriber of it (64). Medicare paid $2.72 per fill, versus $6.39 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Metformin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with California prescribers
Dr. Chan wrote 128 prescriptions for Metformin Hcl, about 1.3 times as often as the typical California prescriber of it (100). Medicare paid $5.99 per fill, versus $9.26 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat high blood pressure.
Compared with California prescribers
Dr. Chan wrote 109 prescriptions for Hydrochlorothiazide, about 1.8 times as often as the typical California prescriber of it (62). Medicare paid $4.46 per fill, versus $5.71 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Famotidine is used to treat ulcers of the stomach and intestines and to prevent intestinal ulcers from coming back after they have healed.
Compared with California prescribers
Dr. Chan wrote 100 prescriptions for Famotidine, about 1.9 times as often as the typical California prescriber of it (54). Medicare paid $5.04 per fill, versus $12.66 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Metoprolol is used with or without other medications to treat high blood pressure (hypertension).
Compared with California prescribers
Dr. Chan wrote 97 prescriptions for Metoprolol Tartrate, about 1.7 times as often as the typical California prescriber of it (57). Medicare paid $5.48 per fill, versus $7.82 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Clopidogrel is used to prevent heart attacks and strokes in persons with heart disease (recent heart attack), recent stroke, or blood circulation disease (peripheral vascular disease).
Compared with California prescribers
Dr. Chan wrote 74 prescriptions for Clopidogrel, about 1.5 times as often as the typical California prescriber of it (48). Medicare paid $11.82 per fill, versus $12.42 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Isosorbide mononitrate is used to prevent chest pain (angina) in patients with a certain heart condition (coronary artery disease).
Compared with California prescribers
Dr. Chan wrote 72 prescriptions for Isosorbide Mononitrate Er, about 2.1 times as often as the typical California prescriber of it (35). Medicare paid $14.46 per fill, versus $14.01 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Spironolactone is used to treat high blood pressure and heart failure.
Compared with California prescribers
Dr. Chan wrote 72 prescriptions for Spironolactone, about 1.9 times as often as the typical California prescriber of it (37). Medicare paid $6.44 per fill, versus $10.05 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Digoxin is used to treat heart failure, usually along with other medications.
Compared with California prescribers
Dr. Chan wrote 68 prescriptions for Digoxin, about 2.3 times as often as the typical California prescriber of it (29). Medicare paid $23.94 per fill, versus $22.84 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Lisinopril is used to treat high blood pressure.
Compared with California prescribers
Dr. Chan wrote 61 prescriptions for Lisinopril, about 63% as often as the typical California prescriber of it (98). Medicare paid $7.24 per fill, versus $8.30 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Pantoprazole is used to treat certain stomach and esophagus problems (such as acid reflux).
Compared with California prescribers
Dr. Chan wrote 52 prescriptions for Pantoprazole Sodium, about 80% as often as the typical California prescriber of it (65). Medicare paid $8.58 per fill, versus $13.87 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat a variety of skin conditions (such as eczema, dermatitis, allergies, rash).
Compared with California prescribers
Dr. Chan wrote 52 prescriptions for Triamcinolone Acetonide, about 1.2 times as often as the typical California prescriber of it (43). Medicare paid $4.78 per fill, versus $10.03 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Gabapentin is used with other medications to prevent and control seizures.
Compared with California prescribers
Dr. Chan wrote 51 prescriptions for Gabapentin, about 64% as often as the typical California prescriber of it (80). Medicare paid $4.94 per fill, versus $15.63 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Omeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).
Compared with California prescribers
Dr. Chan wrote 49 prescriptions for Omeprazole, about 63% as often as the typical California prescriber of it (78). Medicare paid $7.65 per fill, versus $11.26 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Allopurinol is used to treat gout and certain types of kidney stones.
Compared with California prescribers
Dr. Chan wrote 48 prescriptions for Allopurinol, about as often as the typical California prescriber of it (44). Medicare paid $4.87 per fill, versus $10.39 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Tamsulosin is used by men to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH).
Compared with California prescribers
Dr. Chan wrote 47 prescriptions for Tamsulosin Hcl, about half as often as the typical California prescriber of it (84). Medicare paid $18.49 per fill, versus $15.02 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
See also Warning section.
Compared with California prescribers
Dr. Chan wrote 41 prescriptions for Diclofenac Sodium, about 87% as often as the typical California prescriber of it (47). Medicare paid $13.03 per fill, versus $107.23 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Simvastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with California prescribers
Dr. Chan wrote 39 prescriptions for Simvastatin, about 62% as often as the typical California prescriber of it (63). Medicare paid $6.73 per fill, versus $9.03 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Sitagliptin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with California prescribers
Dr. Chan wrote 37 prescriptions for Januvia, about 89% as often as the typical California prescriber of it (41). Medicare paid $1,253.86 per fill, versus $915.30 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Dapagliflozin is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with California prescribers
Dr. Chan wrote 34 prescriptions for Farxiga, about 65% as often as the typical California prescriber of it (52). Medicare paid $992.65 per fill, versus $914.82 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Carvedilol is used to treat high blood pressure and heart failure.
Compared with California prescribers
Dr. Chan wrote 31 prescriptions for Carvedilol, about half as often as the typical California prescriber of it (56). Medicare paid $10.64 per fill, versus $8.98 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Glipizide is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with California prescribers
Dr. Chan wrote 31 prescriptions for Glipizide, about 63% as often as the typical California prescriber of it (49). Medicare paid $6.13 per fill, versus $10.86 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with California prescribers
Dr. Chan wrote 30 prescriptions for Levothyroxine Sodium, about 24% as often as the typical California prescriber of it (125). Medicare paid $14.45 per fill, versus $13.30 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Benazepril is used to treat high blood pressure (hypertension).
Compared with California prescribers
Dr. Chan wrote 27 prescriptions for Benazepril Hcl, about 78% as often as the typical California prescriber of it (35). Medicare paid $8.54 per fill, versus $11.17 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This product is used to control and prevent symptoms (wheezing and shortness of breath) caused by asthma or ongoing lung disease (chronic obstructive pulmonary disease-COPD, which includes chronic bronchitis and emphysema).
Compared with California prescribers
Dr. Chan wrote 26 prescriptions for Fluticasone-Salmeterol, about as often as the typical California prescriber of it (24). Medicare paid $72.70 per fill, versus $155.85 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Finasteride is used to shrink an enlarged prostate (benign prostatic hyperplasia or BPH) in adult men.
Compared with California prescribers
Dr. Chan wrote 25 prescriptions for Finasteride, about half as often as the typical California prescriber of it (56). Medicare paid $7.53 per fill, versus $13.71 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Hydralazine is used with or without other medications to treat high blood pressure.
Compared with California prescribers
Dr. Chan wrote 23 prescriptions for Hydralazine Hcl, about half as often as the typical California prescriber of it (43). Medicare paid $8.66 per fill, versus $14.35 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to prevent or treat gout attacks (flares).
Compared with California prescribers
Dr. Chan wrote 22 prescriptions for Colchicine, about 86% as often as the typical California prescriber of it (26). Medicare paid $21.00 per fill, versus $45.46 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat depression.
Compared with California prescribers
Dr. Chan wrote 21 prescriptions for Trazodone Hcl, about 37% as often as the typical California prescriber of it (57). Medicare paid $2.36 per fill, versus $9.93 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Rivaroxaban is used to prevent blood clots from forming due to a certain irregular heartbeat (atrial fibrillation) or after hip or knee replacement surgery.
Compared with California prescribers
Dr. Chan wrote 21 prescriptions for Xarelto, about half as often as the typical California prescriber of it (43). Medicare paid $1,587.82 per fill, versus $952.66 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain conditions of the stomach and intestines.
Compared with California prescribers
Dr. Chan wrote 20 prescriptions for Metoclopramide Hcl, about 80% as often as the typical California prescriber of it (25). Medicare paid $4.93 per fill, versus $8.32 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Empagliflozin is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with California prescribers
Dr. Chan wrote 19 prescriptions for Jardiance, about 33% as often as the typical California prescriber of it (58). Medicare paid $1,108.55 per fill, versus $933.82 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat a wide variety of bacterial infections, including those that cause acne.
Compared with California prescribers
Dr. Chan wrote 18 prescriptions for Doxycycline Hyclate, about 62% as often as the typical California prescriber of it (29). Medicare paid $11.77 per fill, versus $13.89 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Glimepiride is used with a proper diet and exercise program to control high blood sugar in people with type 2 diabetes.
Compared with California prescribers
Dr. Chan wrote 18 prescriptions for Glimepiride, about half as often as the typical California prescriber of it (40). Medicare paid $16.96 per fill, versus $9.24 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This product is used to treat certain types of heart failure.
Compared with California prescribers
Dr. Chan wrote 17 prescriptions for Entresto, about 30% as often as the typical California prescriber of it (57). Medicare paid $1,394.70 per fill, versus $1,043.51 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Lovastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with California prescribers
Dr. Chan wrote 16 prescriptions for Lovastatin, about half as often as the typical California prescriber of it (30). Medicare paid $12.76 per fill, versus $10.38 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Meclizine is an antihistamine that is used to prevent and treat nausea, vomiting, and dizziness caused by motion sickness.
Compared with California prescribers
Dr. Chan wrote 16 prescriptions for Meclizine Hcl, about half as often as the typical California prescriber of it (37). Medicare paid $2.69 per fill, versus $7.01 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain types of serious (possibly fatal) irregular heartbeat (such as recurrent ventricular fibrillation/tachycardia).
Compared with California prescribers
Dr. Chan wrote 15 prescriptions for Amiodarone Hcl, about 35% as often as the typical California prescriber of it (43). Medicare paid $13.82 per fill, versus $30.86 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This drug is used to treat high blood pressure.
Compared with California prescribers
Dr. Chan wrote 15 prescriptions for Losartan-Hydrochlorothiazide, about 38% as often as the typical California prescriber of it (39). Medicare paid $11.06 per fill, versus $13.09 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Alendronate is used to prevent and treat certain types of bone loss (osteoporosis) in adults.
Compared with California prescribers
Dr. Chan wrote 14 prescriptions for Alendronate Sodium, about 23% as often as the typical California prescriber of it (61). Medicare paid $7.82 per fill, versus $9.65 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Amoxicillin/clavulanic acid is a combination penicillin-type antibiotic used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Chan wrote 14 prescriptions for Amoxicillin-Clavulanate Potass, about half as often as the typical California prescriber of it (26). Medicare paid $8.92 per fill, versus $9.18 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Diltiazem is used to treat high blood pressure (hypertension) and prevent chest pain (angina).
Compared with California prescribers
Dr. Chan wrote 14 prescriptions for Diltiazem 24hr Er (Cd), about half as often as the typical California prescriber of it (28). Medicare paid $40.59 per fill, versus $32.58 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat anxiety.
Compared with California prescribers
Dr. Chan wrote 13 prescriptions for Lorazepam, about 30% as often as the typical California prescriber of it (43). Medicare paid $5.67 per fill, versus $6.52 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This diabetes medication is a combination of 2 drugs (glipizide and metformin).
Compared with California prescribers
Dr. Chan wrote 12 prescriptions for Glipizide-Metformin, about 40% as often as the typical California prescriber of it (30). Medicare paid $56.17 per fill, versus $62.93 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Hydroxyzine is used to treat itching caused by allergies.
Compared with California prescribers
Dr. Chan wrote 12 prescriptions for Hydroxyzine Hcl, about half as often as the typical California prescriber of it (28). Medicare paid $0.47 per fill, versus $13.85 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Pravastatin is used along with a proper diet to help lower "bad" cholesterol and fats (such as LDL, triglycerides) and raise "good" cholesterol (HDL) in the blood.
Compared with California prescribers
Dr. Chan wrote 12 prescriptions for Pravastatin Sodium, about 32% as often as the typical California prescriber of it (38). Medicare paid $7.20 per fill, versus $13.25 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, bipolar disorder, irritability associated with autistic disorder).
Compared with California prescribers
Dr. Chan wrote 12 prescriptions for Risperidone, about 24% as often as the typical California prescriber of it (49). Medicare paid $21.11 per fill, versus $13.84 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Terazosin is used alone or with other drugs to treat high blood pressure (hypertension).
Compared with California prescribers
Dr. Chan wrote 12 prescriptions for Terazosin Hcl, about 33% as often as the typical California prescriber of it (36). Medicare paid $7.19 per fill, versus $37.76 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
What it is used for
Linagliptin is used with a proper diet and exercise program and possibly with other medications to control high blood sugar.
Compared with California prescribers
Dr. Chan wrote 12 prescriptions for Tradjenta, about 31% as often as the typical California prescriber of it (38). Medicare paid $911.20 per fill, versus $724.16 statewide.
Volume reflects how many Medicare patients a practice sees as well as prescribing habits. It is not a measure of quality.
Questions about Dr. Chan’s prescriptions
What does Dr. Chan prescribe most?
In 2024 Medicare Part D data, Dr. Chan's most prescribed medications were Amlodipine Besylate (342), Atorvastatin Calcium (340) and Metoprolol Succinate (326).
How does Dr. Chan's prescribing compare with other California prescribers?
Of the 54 medications with a state comparison, Dr. Chan prescribes 14 more often than the typical California prescriber, 9 about as often and 31 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Chan prescribes?
No. It covers prescriptions filled by people with Medicare Part D drug coverage in 2024, and CMS leaves out any medication with fewer than 11 prescriptions.
About this data
This page shows one provider’s slice of public Medicare files. NPI Profile does not receive prescriptions or patient records.
| Source | What it provides here | Data year |
|---|---|---|
| CMS Medicare Part D Prescribers by Provider and Drug | Each medication, prescriptions, patients, 30-day fills, days of medication and cost. State comparisons average the California prescribers of the same medication and form, where at least five wrote it. | 2024 (released 2026, the most recent available) |
| CMS Medicare Part D Drug Spending Dashboard | What each medication is used for. | 2024 |
- Only prescriptions filled by people with Medicare Part D drug coverage are counted. Private insurance, Medicaid and cash purchases are not.
- CMS leaves out medications with fewer than 11 prescriptions and hides patient counts under 11.
- Cost per fill is what the plan and the patient paid the pharmacy together, not what you pay at the counter.
- Medication descriptions are summaries from CMS. They are not medical advice; ask a health care professional about any medication.
