TRESA ELIZABETH ZACHARIAS MD
Prescription History 1366838708
Psychiatry & Neurology - Neurology in Chicago, IL
What does Dr. Zacharias prescribe?
In 2024, Dr. Zacharias wrote 330 Medicare prescriptions for 10 medications. The most prescribed was Emgality Pen (galcanezumab-gnlm), with 71 prescriptions for 11 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. Zacharias prescribes.
Medications 10 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
This medication is used to help prevent migraine.
Compared with Illinois prescribers
Dr. Zacharias wrote 71 prescriptions for Emgality Pen, about 2.2 times as often as the typical Illinois prescriber of it (32). Medicare paid $769.47 per fill, versus $825.54 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
Donepezil is used to treat confusion (dementia) related to Alzheimer's disease.
Compared with Illinois prescribers
Dr. Zacharias wrote 69 prescriptions for Donepezil Hcl, about as often as the typical Illinois prescriber of it (67). Medicare paid $13.29 per fill, versus $11.52 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
Gabapentin is used with other medications to prevent and control seizures.
Compared with Illinois prescribers
Dr. Zacharias wrote 56 prescriptions for Gabapentin, about 65% as often as the typical Illinois prescriber of it (87). Medicare paid $15.50 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
Memantine is used to treat moderate to severe confusion (dementia) related to Alzheimer's disease.
Compared with Illinois prescribers
Dr. Zacharias wrote 35 prescriptions for Memantine Hcl, about half as often as the typical Illinois prescriber of it (66). Medicare paid $35.54 per fill, versus $30.45 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
Sumatriptan is used to treat migraines.
Compared with Illinois prescribers
Dr. Zacharias wrote 23 prescriptions for Sumatriptan Succinate, about as often as the typical Illinois prescriber of it (22). Medicare paid $39.96 per fill, versus $16.86 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
Rizatriptan is used to treat migraines.
Compared with Illinois prescribers
Dr. Zacharias wrote 18 prescriptions for Rizatriptan, about 88% as often as the typical Illinois prescriber of it (21). Medicare paid $19.90 per fill, versus $17.87 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 help prevent migraine.
Compared with Illinois prescribers
Dr. Zacharias wrote 16 prescriptions for Aimovig Autoinjector, about half as often as the typical Illinois prescriber of it (31). Medicare paid $720.76 per fill, versus $839.25 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
Lamotrigine is used alone or with other medications to prevent and control seizures.
Compared with Illinois prescribers
Dr. Zacharias wrote 15 prescriptions for Lamotrigine, about 30% as often as the typical Illinois prescriber of it (50). Medicare paid $2.85 per fill, versus $12.11 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
Clonazepam is used to prevent and control seizures.
Compared with Illinois prescribers
Dr. Zacharias wrote 14 prescriptions for Clonazepam, about 29% as often as the typical Illinois prescriber of it (48). Medicare paid $1.68 per fill, versus $7.29 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
Levetiracetam is used to treat seizures (epilepsy).
Compared with Illinois prescribers
Dr. Zacharias wrote 13 prescriptions for Levetiracetam, about 22% as often as the typical Illinois prescriber of it (58). Medicare paid $37.54 per fill, versus $30.94 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. Zacharias’s prescriptions
What does Dr. Zacharias prescribe most?
In 2024 Medicare Part D data, Dr. Zacharias's most prescribed medications were Emgality Pen (71), Donepezil Hcl (69) and Gabapentin (56).
How does Dr. Zacharias's prescribing compare with other Illinois prescribers?
Of the 10 medications with a state comparison, Dr. Zacharias prescribes 1 more often than the typical Illinois prescriber, 3 about as often and 6 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Zacharias 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.
