COLIN MACKAY MD
Prescription History 1912683087
Internal Medicine in Evansville, IN
What does Dr. Mackay prescribe?
In 2024, Dr. Mackay wrote 248 Medicare prescriptions for 15 medications. The most prescribed was Gabapentin, with 29 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. Mackay prescribes.
Medications 15 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 Indiana prescribers.
What it is used for
Gabapentin is used with other medications to prevent and control seizures.
Compared with Indiana prescribers
Dr. Mackay wrote 29 prescriptions for Gabapentin, about 26% as often as the typical Indiana prescriber of it (110). Medicare paid $9.04 per fill, versus $14.41 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 Indiana prescribers
Dr. Mackay wrote 25 prescriptions for Atorvastatin Calcium, about 11% as often as the typical Indiana prescriber of it (236). Medicare paid $9.12 per fill, versus $8.26 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
Memantine is used to treat moderate to severe confusion (dementia) related to Alzheimer's disease.
Compared with Indiana prescribers
Dr. Mackay wrote 21 prescriptions for Memantine Hcl, about 26% as often as the typical Indiana prescriber of it (79). Medicare paid $12.80 per fill, versus $33.05 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
Carvedilol is used to treat high blood pressure and heart failure.
Compared with Indiana prescribers
Dr. Mackay wrote 20 prescriptions for Carvedilol, about 25% as often as the typical Indiana prescriber of it (81). Medicare paid $2.57 per fill, versus $7.58 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
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 Indiana prescribers
Dr. Mackay wrote 17 prescriptions for Furosemide, about 17% as often as the typical Indiana prescriber of it (99). Medicare paid $1.12 per fill, versus $4.55 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, anxiety).
Compared with Indiana prescribers
Dr. Mackay wrote 16 prescriptions for Duloxetine Hcl, about 25% as often as the typical Indiana prescriber of it (63). Medicare paid $10.14 per fill, versus $23.69 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
Amlodipine is used with or without other medications to treat high blood pressure.
Compared with Indiana prescribers
Dr. Mackay wrote 15 prescriptions for Amlodipine Besylate, about 9% as often as the typical Indiana prescriber of it (162). Medicare paid $5.42 per fill, versus $5.38 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 a mineral supplement used to treat or prevent low amounts of potassium in the blood.
Compared with Indiana prescribers
Dr. Mackay wrote 15 prescriptions for Potassium Chloride, about 19% as often as the typical Indiana prescriber of it (77). Medicare paid $3.38 per fill, versus $19.91 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
Nifedipine is used alone or in combination with other drugs to treat high blood pressure (hypertension).
Compared with Indiana prescribers
Dr. Mackay wrote 14 prescriptions for Nifedipine Er, about half as often as the typical Indiana prescriber of it (28). Medicare paid $5.80 per fill, versus $25.43 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).
Compared with Indiana prescribers
Dr. Mackay wrote 14 prescriptions for Olanzapine, about 26% as often as the typical Indiana prescriber of it (54). Medicare paid $16.29 per fill, versus $32.89 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
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 Indiana prescribers
Dr. Mackay wrote 13 prescriptions for Eliquis, about 13% as often as the typical Indiana prescriber of it (103). Medicare paid $877.01 per fill, versus $840.97 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 Indiana prescribers
Dr. Mackay wrote 13 prescriptions for Lisinopril, about 10% as often as the typical Indiana prescriber of it (132). Medicare paid $0.76 per fill, versus $5.63 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 certain mental/mood disorders (such as depression, anxiety).
Compared with Indiana prescribers
Dr. Mackay wrote 12 prescriptions for Escitalopram Oxalate, about 19% as often as the typical Indiana prescriber of it (65). Medicare paid $9.19 per fill, versus $10.43 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 Indiana prescribers
Dr. Mackay wrote 12 prescriptions for Hydrochlorothiazide, about 16% as often as the typical Indiana prescriber of it (77). Medicare paid $5.13 per fill, versus $3.70 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 (such as wheezing and shortness of breath) caused by asthma and ongoing lung disease (chronic obstructive pulmonary disease-COPD, which includes chronic bronchitis and emphysema).
Compared with Indiana prescribers
Dr. Mackay wrote 12 prescriptions for Trelegy Ellipta, about 19% as often as the typical Indiana prescriber of it (62). Medicare paid $847.31 per fill, versus $886.77 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. Mackay’s prescriptions
What does Dr. Mackay prescribe most?
In 2024 Medicare Part D data, Dr. Mackay's most prescribed medications were Gabapentin (29), Atorvastatin Calcium (25) and Memantine Hcl (21).
How does Dr. Mackay's prescribing compare with other Indiana prescribers?
Of the 15 medications with a state comparison, Dr. Mackay prescribes 15 less often than the typical Indiana prescriber. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Mackay 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 Indiana 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.
