MR. SO LAWRENCE ONISHI MD
Prescription History 1699192575
Emergency Medicine in San Diego, CA
What does Dr. Onishi prescribe?
In 2024, Dr. Onishi wrote 98 Medicare prescriptions for 5 medications. The most prescribed was Cephalexin, with 25 prescriptions for 25 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. Onishi prescribes.
Medications 5 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 California prescribers.
What it is used for
This medication is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Onishi wrote 25 prescriptions for Cephalexin, about 84% as often as the typical California prescriber of it (30). Medicare paid $9.87 per fill, versus $7.62 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 wide variety of bacterial infections.
Compared with California prescribers
Dr. Onishi wrote 22 prescriptions for Cefpodoxime Proxetil, about as often as the typical California prescriber of it (22). Medicare paid $35.69 per fill, versus $35.49 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
Amoxicillin/clavulanic acid is a combination penicillin-type antibiotic used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Onishi wrote 19 prescriptions for Amoxicillin-Clavulanate Potass, about 74% as often as the typical California prescriber of it (26). Medicare paid $14.79 per fill, versus $9.18 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 combination medication is used to relieve moderate to severe pain.
Compared with California prescribers
Dr. Onishi wrote 18 prescriptions for Hydrocodone-Acetaminophen, about 24% as often as the typical California prescriber of it (76). Medicare paid $7.42 per fill, versus $21.39 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 combination of two antibiotics: sulfamethoxazole and trimethoprim.
Compared with California prescribers
Dr. Onishi wrote 14 prescriptions for Sulfamethoxazole-Trimethoprim, about half as often as the typical California prescriber of it (25). Medicare paid $6.65 per fill, versus $4.62 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. Onishi’s prescriptions
What does Dr. Onishi prescribe most?
In 2024 Medicare Part D data, Dr. Onishi's most prescribed medications were Cephalexin (25), Cefpodoxime Proxetil (22) and Amoxicillin-Clavulanate Potass (19).
How does Dr. Onishi's prescribing compare with other California prescribers?
Of the 5 medications with a state comparison, Dr. Onishi prescribes 2 about as often than the typical California prescriber and 3 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Onishi 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 California 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.
