ERIC R KALLWITZ M.D.
Prescription History 1275716607
Internal Medicine - Gastroenterology in Chicago, IL
What does Dr. Kallwitz prescribe?
In 2024, Dr. Kallwitz wrote 1,995 Medicare prescriptions for 31 medications. The most prescribed was Ursodiol, with 245 prescriptions for 51 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. Kallwitz prescribes.
Medications 31 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 Illinois prescribers.
What it is used for
Ursodiol is used to dissolve certain types of gallstones, to prevent gallstones from forming in obese patients who are losing weight rapidly, and to treat a certain type of liver disease (primary biliary cholangitis).
Compared with Illinois prescribers
Dr. Kallwitz wrote 245 prescriptions for Ursodiol, about 8 times as often as the typical Illinois prescriber of it (31). Medicare paid $141.70 per fill, versus $148.27 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 Illinois prescribers
Dr. Kallwitz wrote 212 prescriptions for Carvedilol, about 3 times as often as the typical Illinois prescriber of it (70). Medicare paid $7.11 per fill, versus $8.63 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
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 Illinois prescribers
Dr. Kallwitz wrote 190 prescriptions for Furosemide, about 2.1 times as often as the typical Illinois prescriber of it (90). Medicare paid $3.61 per fill, versus $5.20 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 form of tacrolimus is used on the skin to treat a skin condition called eczema (atopic dermatitis) in patients who have not responded well to (or should not use) other eczema medications.
Compared with Illinois prescribers
Dr. Kallwitz wrote 167 prescriptions for Tacrolimus, about 4.7 times as often as the typical Illinois prescriber of it (35). Medicare paid $216.89 per fill, versus $147.27 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 Illinois prescribers
Dr. Kallwitz wrote 149 prescriptions for Spironolactone, about 2.9 times as often as the typical Illinois prescriber of it (52). Medicare paid $9.34 per fill, versus $8.46 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
Mycophenolate is used in combination with other medications to keep your body from attacking and rejecting your transplanted kidney.
Compared with Illinois prescribers
Dr. Kallwitz wrote 82 prescriptions for Mycophenolic Acid, about 3 times as often as the typical Illinois prescriber of it (27). Medicare paid $439.65 per fill, versus $274.90 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 Illinois prescribers
Dr. Kallwitz wrote 80 prescriptions for Pantoprazole Sodium, about as often as the typical Illinois prescriber of it (83). Medicare paid $13.84 per fill, versus $12.56 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
Prednisone is used to treat conditions such as arthritis, blood disorders, breathing problems, severe allergies, skin diseases, cancer, eye problems, and immune system disorders.
Compared with Illinois prescribers
Dr. Kallwitz wrote 75 prescriptions for Prednisone, about 1.6 times as often as the typical Illinois prescriber of it (46). Medicare paid $4.30 per fill, versus $3.88 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
Cyclosporine is used to prevent organ rejection in people who have received a liver, kidney, or heart transplant.
Compared with Illinois prescribers
Dr. Kallwitz wrote 72 prescriptions for Cyclosporine Modified, about 3.2 times as often as the typical Illinois prescriber of it (22). Medicare paid $179.02 per fill, versus $156.12 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
Amlodipine is used with or without other medications to treat high blood pressure.
Compared with Illinois prescribers
Dr. Kallwitz wrote 69 prescriptions for Amlodipine Besylate, about half as often as the typical Illinois prescriber of it (146). Medicare paid $4.77 per fill, versus $6.68 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 diarrhea caused by the common bacteria known as E.
Compared with Illinois prescribers
Dr. Kallwitz wrote 67 prescriptions for Xifaxan, about 2.7 times as often as the typical Illinois prescriber of it (25). Medicare paid $4,045.11 per fill, versus $2,682.64 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
Azathioprine is used to prevent organ rejection in people who have received a kidney transplant.
Compared with Illinois prescribers
Dr. Kallwitz wrote 63 prescriptions for Azathioprine, about 2.6 times as often as the typical Illinois prescriber of it (24). Medicare paid $31.14 per fill, versus $56.30 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with Illinois prescribers
Dr. Kallwitz wrote 56 prescriptions for Gabapentin, about 65% as often as the typical Illinois prescriber of it (87). Medicare paid $23.44 per fill, versus $15.83 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
This medication is a laxative used to treat constipation.
Compared with Illinois prescribers
Dr. Kallwitz wrote 51 prescriptions for Lactulose, about 1.7 times as often as the typical Illinois prescriber of it (30). Medicare paid $30.80 per fill, versus $26.06 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
See also Warning section.
Compared with Illinois prescribers
Dr. Kallwitz wrote 46 prescriptions for Entecavir, about 2.1 times as often as the typical Illinois prescriber of it (22). Medicare paid $335.40 per fill, versus $329.31 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
Mycophenolate is used in combination with other medications to keep your body from attacking and rejecting your transplanted organ (such as kidney, liver, heart).
Compared with Illinois prescribers
Dr. Kallwitz wrote 42 prescriptions for Mycophenolate Mofetil, about 1.4 times as often as the typical Illinois prescriber of it (29). Medicare paid $77.40 per fill, versus $117.95 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
Omeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).
Compared with Illinois prescribers
Dr. Kallwitz wrote 37 prescriptions for Omeprazole, about 38% as often as the typical Illinois prescriber of it (96). Medicare paid $7.03 per fill, versus $11.25 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
Metoprolol is used with or without other medications to treat high blood pressure (hypertension).
Compared with Illinois prescribers
Dr. Kallwitz wrote 35 prescriptions for Metoprolol Tartrate, about half as often as the typical Illinois prescriber of it (73). Medicare paid $7.64 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 depression.
Compared with Illinois prescribers
Dr. Kallwitz wrote 34 prescriptions for Trazodone Hcl, about half as often as the typical Illinois prescriber of it (63). Medicare paid $2.79 per fill, versus $8.47 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
Fludrocortisone is a man-made form of a natural substance (glucocorticoid) made by the body.
Compared with Illinois prescribers
Dr. Kallwitz wrote 33 prescriptions for Fludrocortisone Acetate, about 1.5 times as often as the typical Illinois prescriber of it (22). Medicare paid $14.70 per fill, versus $18.89 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
This medication is a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with Illinois prescribers
Dr. Kallwitz wrote 24 prescriptions for Metoprolol Succinate, about 19% as often as the typical Illinois prescriber of it (125). Medicare paid $13.77 per fill, versus $14.27 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 Illinois prescribers
Dr. Kallwitz wrote 23 prescriptions for Hydroxyzine Hcl, about 70% as often as the typical Illinois prescriber of it (33). Medicare paid $35.56 per fill, versus $16.82 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
Bumetanide is used to reduce extra fluid in the body (edema) caused by conditions such as heart failure, liver disease, and kidney disease.
Compared with Illinois prescribers
Dr. Kallwitz wrote 22 prescriptions for Bumetanide, about half as often as the typical Illinois prescriber of it (37). Medicare paid $29.77 per fill, versus $34.58 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
Tamsulosin is used by men to treat the symptoms of an enlarged prostate (benign prostatic hyperplasia-BPH).
Compared with Illinois prescribers
Dr. Kallwitz wrote 21 prescriptions for Tamsulosin Hcl, about 22% as often as the typical Illinois prescriber of it (94). Medicare paid $18.10 per fill, versus $14.59 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
Cholestyramine is used along with a proper diet to lower cholesterol in the blood.
Compared with Illinois prescribers
Dr. Kallwitz wrote 18 prescriptions for Cholestyramine, about 84% as often as the typical Illinois prescriber of it (21). Medicare paid $46.84 per fill, versus $76.30 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
Allopurinol is used to treat gout and certain types of kidney stones.
Compared with Illinois prescribers
Dr. Kallwitz wrote 16 prescriptions for Allopurinol, about 29% as often as the typical Illinois prescriber of it (56). Medicare paid $5.38 per fill, versus $9.73 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
Tenofovir is used with other HIV medications to help control HIV infection.
Compared with Illinois prescribers
Dr. Kallwitz wrote 16 prescriptions for Tenofovir Disoproxil Fumarate, about 83% as often as the typical Illinois prescriber of it (19). Medicare paid $49.89 per fill, versus $362.90 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
Lamivudine-HBV is used to treat hepatitis B infection.
Compared with Illinois prescribers
Dr. Kallwitz wrote 13 prescriptions for Lamivudine Hbv, about as often as the typical Illinois prescriber of it (14). Medicare paid $431.61 per fill, versus $149.85 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
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 Illinois prescribers
Dr. Kallwitz wrote 13 prescriptions for Simvastatin, about 17% as often as the typical Illinois prescriber of it (75). Medicare paid $5.68 per fill, versus $8.10 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
This drug is used by mouth or rectally to treat or prevent complications of liver disease (hepatic encephalopathy).
Compared with Illinois prescribers
Dr. Kallwitz wrote 12 prescriptions for Enulose, about 33% as often as the typical Illinois prescriber of it (37). Medicare paid $40.37 per fill, versus $25.67 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
Tenofovir alafenamide is used to treat chronic hepatitis B infection, a viral infection of the liver.
Compared with Illinois prescribers
Dr. Kallwitz wrote 12 prescriptions for Vemlidy, about half as often as the typical Illinois prescriber of it (24). Medicare paid $1,439.84 per fill, versus $1,619.81 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. Kallwitz’s prescriptions
What does Dr. Kallwitz prescribe most?
In 2024 Medicare Part D data, Dr. Kallwitz's most prescribed medications were Ursodiol (245), Carvedilol (212) and Furosemide (190).
How does Dr. Kallwitz's prescribing compare with other Illinois prescribers?
Of the 31 medications with a state comparison, Dr. Kallwitz prescribes 14 more often than the typical Illinois prescriber, 4 about as often and 13 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Kallwitz 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 Illinois 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.
