DR. LUIS ALBERTO LOPEZ CASTRO M.D.
Prescription History 1881742021
General Practice in Ponce, PR
What does Dr. Lopez Castro prescribe?
In 2024, Dr. Lopez Castro wrote 739 Medicare prescriptions for 32 medications. The most prescribed was Metformin Hcl, with 43 prescriptions for 15 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. Lopez Castro prescribes.
Medications 32 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 Puerto Rico prescribers.
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 Puerto Rico prescribers
Dr. Lopez Castro wrote 43 prescriptions for Metformin Hcl, about 21% as often as the typical Puerto Rico prescriber of it (204). Medicare paid $7.95 per fill, versus $6.34 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 41 prescriptions for Atorvastatin Calcium, about 12% as often as the typical Puerto Rico prescriber of it (337). Medicare paid $13.98 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
This medication is used to treat a certain sleep problem (insomnia).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 39 prescriptions for Temazepam, about 23% as often as the typical Puerto Rico prescriber of it (168). Medicare paid $10.54 per fill, versus $9.16 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
Alprazolam is used to treat anxiety and panic disorders.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 38 prescriptions for Alprazolam, about 38% as often as the typical Puerto Rico prescriber of it (101). Medicare paid $5.46 per fill, versus $7.48 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 38 prescriptions for Lisinopril, about 23% as often as the typical Puerto Rico prescriber of it (163). Medicare paid $7.36 per fill, versus $5.61 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 36 prescriptions for Famotidine, about 18% as often as the typical Puerto Rico prescriber of it (204). Medicare paid $6.29 per fill, versus $7.25 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
Rosuvastatin 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 35 prescriptions for Rosuvastatin Calcium, about 19% as often as the typical Puerto Rico prescriber of it (185). Medicare paid $12.84 per fill, versus $12.35 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
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 33 prescriptions for Levothyroxine Sodium, about 18% as often as the typical Puerto Rico prescriber of it (183). Medicare paid $17.44 per fill, versus $11.95 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 32 prescriptions for Glimepiride, about 32% as often as the typical Puerto Rico prescriber of it (101). Medicare paid $14.26 per fill, versus $15.37 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
Amlodipine is used with or without other medications to treat high blood pressure.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 28 prescriptions for Amlodipine Besylate, about 13% as often as the typical Puerto Rico prescriber of it (210). Medicare paid $5.71 per fill, versus $5.10 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 28 prescriptions for Simvastatin, about 15% as often as the typical Puerto Rico prescriber of it (193). Medicare paid $6.83 per fill, versus $7.24 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 medication is a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 25 prescriptions for Metoprolol Succinate, about 14% as often as the typical Puerto Rico prescriber of it (176). Medicare paid $21.77 per fill, versus $15.32 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
Levothyroxine is used to treat an underactive thyroid (hypothyroidism).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 23 prescriptions for Synthroid, about 10% as often as the typical Puerto Rico prescriber of it (233). Medicare paid $119.86 per fill, versus $76.31 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 22 prescriptions for Gabapentin, about 8% as often as the typical Puerto Rico prescriber of it (262). Medicare paid $14.83 per fill, versus $9.88 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 20 prescriptions for Losartan Potassium, about 8% as often as the typical Puerto Rico prescriber of it (247). Medicare paid $16.50 per fill, versus $10.77 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 nonsteroidal anti-inflammatory drug (NSAID), specifically a COX-2 inhibitor, which relieves pain and swelling (inflammation).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 19 prescriptions for Celecoxib, about half as often as the typical Puerto Rico prescriber of it (33). Medicare paid $15.36 per fill, versus $16.21 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 19 prescriptions for Pantoprazole Sodium, about 13% as often as the typical Puerto Rico prescriber of it (142). Medicare paid $8.65 per fill, versus $8.42 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
This medication is used alone or with other medications to treat high blood pressure (hypertension).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 18 prescriptions for Clonidine Hcl, about half as often as the typical Puerto Rico prescriber of it (33). Medicare paid $10.66 per fill, versus $7.19 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 18 prescriptions for Diclofenac Sodium, about 26% as often as the typical Puerto Rico prescriber of it (69). Medicare paid $8.61 per fill, versus $16.14 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 17 prescriptions for Alendronate Sodium, about 14% as often as the typical Puerto Rico prescriber of it (118). Medicare paid $10.83 per fill, versus $7.83 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
Doxazosin is used alone or with other drugs to treat high blood pressure (hypertension).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 17 prescriptions for Doxazosin Mesylate, about 26% as often as the typical Puerto Rico prescriber of it (66). Medicare paid $25.74 per fill, versus $19.06 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 16 prescriptions for Furosemide, about 20% as often as the typical Puerto Rico prescriber of it (82). Medicare paid $6.29 per fill, versus $5.52 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
Atenolol is used with or without other medications to treat high blood pressure (hypertension).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 15 prescriptions for Atenolol, about 32% as often as the typical Puerto Rico prescriber of it (46). Medicare paid $7.91 per fill, versus $6.89 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
Cilostazol is used to improve the symptoms of a certain blood flow problem in the legs (intermittent claudication).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 14 prescriptions for Cilostazol, about 27% as often as the typical Puerto Rico prescriber of it (52). Medicare paid $19.30 per fill, versus $24.73 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 14 prescriptions for Clopidogrel, about 13% as often as the typical Puerto Rico prescriber of it (109). Medicare paid $21.86 per fill, versus $10.63 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
This medication is used to treat anxiety.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 14 prescriptions for Lorazepam, about 12% as often as the typical Puerto Rico prescriber of it (116). Medicare paid $4.93 per fill, versus $8.38 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
This medication is used to treat depression.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 14 prescriptions for Mirtazapine, about 12% as often as the typical Puerto Rico prescriber of it (116). Medicare paid $9.95 per fill, versus $14.12 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, sudden episodes of mania or depression associated with bipolar disorder).
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 14 prescriptions for Quetiapine Fumarate, about 11% as often as the typical Puerto Rico prescriber of it (123). Medicare paid $6.21 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
Insulin glargine is used with a proper diet and exercise program to control high blood sugar in people with diabetes.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 13 prescriptions for Lantus, about 17% as often as the typical Puerto Rico prescriber of it (78). Medicare paid $157.46 per fill, versus $105.17 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
Meclizine is an antihistamine that is used to prevent and treat nausea, vomiting, and dizziness caused by motion sickness.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 13 prescriptions for Meclizine Hcl, about 33% as often as the typical Puerto Rico prescriber of it (40). Medicare paid $9.22 per fill, versus $8.95 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
Zolpidem is used for a short time to treat a certain sleep problem (insomnia) in adults.
Compared with Puerto Rico prescribers
Dr. Lopez Castro wrote 12 prescriptions for Zolpidem Tartrate, about 15% as often as the typical Puerto Rico prescriber of it (79). Medicare paid $4.45 per fill, versus $8.12 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 Puerto Rico prescribers
Dr. Lopez Castro wrote 11 prescriptions for Tamsulosin Hcl, about 9% as often as the typical Puerto Rico prescriber of it (127). Medicare paid $17.78 per fill, versus $10.59 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. Lopez Castro’s prescriptions
What does Dr. Lopez Castro prescribe most?
In 2024 Medicare Part D data, Dr. Lopez Castro's most prescribed medications were Metformin Hcl (43), Atorvastatin Calcium (41) and Temazepam (39).
How does Dr. Lopez Castro's prescribing compare with other Puerto Rico prescribers?
Of the 32 medications with a state comparison, Dr. Lopez Castro prescribes 32 less often than the typical Puerto Rico prescriber. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Lopez Castro 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 Puerto Rico 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.
