DR. MEGAN BRADLEY CALLAHAN M.D.
Prescription History 1881662864
Internal Medicine in Everett, MA
What does Dr. Callahan prescribe?
In 2024, Dr. Callahan wrote 222 Medicare prescriptions for 13 medications. The most prescribed was Eliquis (apixaban), with 34 prescriptions.
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. Callahan prescribes.
Medications 13 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 Massachusetts prescribers.
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 Massachusetts prescribers
Dr. Callahan wrote 34 prescriptions for Eliquis, about 39% as often as the typical Massachusetts prescriber of it (88). Medicare paid $299.32 per fill, versus $852.50 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 Massachusetts prescribers
Dr. Callahan wrote 30 prescriptions for Atorvastatin Calcium, about 16% as often as the typical Massachusetts prescriber of it (188). Medicare paid $31.56 per fill, versus $13.82 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 a beta-blocker used to treat chest pain (angina), heart failure, and high blood pressure.
Compared with Massachusetts prescribers
Dr. Callahan wrote 21 prescriptions for Metoprolol Succinate, about 19% as often as the typical Massachusetts prescriber of it (112). Medicare paid $10.26 per fill, versus $18.15 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
Rivastigmine is used to treat confusion (dementia) related to Alzheimer's disease and to Parkinson's disease.
Compared with Massachusetts prescribers
Dr. Callahan wrote 19 prescriptions for Rivastigmine, about 76% as often as the typical Massachusetts prescriber of it (25). Medicare paid $170.27 per fill, versus $216.69 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 depression, panic attacks, obsessive compulsive disorder, post-traumatic stress disorder, social anxiety disorder).
Compared with Massachusetts prescribers
Dr. Callahan wrote 19 prescriptions for Sertraline Hcl, about 30% as often as the typical Massachusetts prescriber of it (62). Medicare paid $12.08 per fill, versus $10.02 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
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 Massachusetts prescribers
Dr. Callahan wrote 14 prescriptions for Furosemide, about 19% as often as the typical Massachusetts prescriber of it (72). Medicare paid $5.39 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
This medication is used to treat seizure disorders, mental/mood conditions (such as manic phase of bipolar disorder), and to prevent migraine headaches.
Compared with Massachusetts prescribers
Dr. Callahan wrote 13 prescriptions for Divalproex Sodium Er, about 37% as often as the typical Massachusetts prescriber of it (35). Medicare paid $187.17 per fill, versus $45.87 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
Omeprazole is used to treat certain stomach and esophagus problems (such as acid reflux, ulcers).
Compared with Massachusetts prescribers
Dr. Callahan wrote 13 prescriptions for Omeprazole, about 13% as often as the typical Massachusetts prescriber of it (97). Medicare paid $8.46 per fill, versus $15.75 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 Massachusetts prescribers
Dr. Callahan wrote 12 prescriptions for Amlodipine Besylate, about 10% as often as the typical Massachusetts prescriber of it (126). Medicare paid $9.42 per fill, versus $7.46 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with Massachusetts prescribers
Dr. Callahan wrote 12 prescriptions for Gabapentin, about 15% as often as the typical Massachusetts prescriber of it (80). Medicare paid $7.02 per fill, versus $14.49 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
Lamotrigine is used alone or with other medications to prevent and control seizures.
Compared with Massachusetts prescribers
Dr. Callahan wrote 12 prescriptions for Lamotrigine, about 23% as often as the typical Massachusetts prescriber of it (52). Medicare paid $11.25 per fill, versus $15.23 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 Massachusetts prescribers
Dr. Callahan wrote 12 prescriptions for Losartan Potassium, about 13% as often as the typical Massachusetts prescriber of it (90). Medicare paid $5.95 per fill, versus $11.50 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 Massachusetts prescribers
Dr. Callahan wrote 11 prescriptions for Trazodone Hcl, about 15% as often as the typical Massachusetts prescriber of it (72). Medicare paid $5.73 per fill, versus $9.86 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. Callahan’s prescriptions
What does Dr. Callahan prescribe most?
In 2024 Medicare Part D data, Dr. Callahan's most prescribed medications were Eliquis (34), Atorvastatin Calcium (30) and Metoprolol Succinate (21).
How does Dr. Callahan's prescribing compare with other Massachusetts prescribers?
Of the 13 medications with a state comparison, Dr. Callahan prescribes 1 about as often than the typical Massachusetts prescriber and 12 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Callahan 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 Massachusetts 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.
