ERICK CASTILLO M.D., M.P.H
Prescription History 1891237467
Student in an Organized Health Care Education/Training Program in Los Angeles, CA
What does Dr. Castillo prescribe?
In 2024, Dr. Castillo wrote 412 Medicare prescriptions for 15 medications. The most prescribed was Prednisone, with 91 prescriptions for 86 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. Castillo 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 California prescribers.
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 California prescribers
Dr. Castillo wrote 91 prescriptions for Prednisone, about 2.3 times as often as the typical California prescriber of it (40). Medicare paid $0.95 per fill, versus $5.64 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
Azithromycin is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Castillo wrote 48 prescriptions for Azithromycin, about 1.3 times as often as the typical California prescriber of it (38). Medicare paid $2.23 per fill, versus $4.49 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
This medication is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Castillo wrote 39 prescriptions for Cephalexin, about 1.3 times as often as the typical California prescriber of it (30). Medicare paid $8.07 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
Ibuprofen is used to relieve pain from various conditions such as headache, dental pain, menstrual cramps, muscle aches, or arthritis.
Compared with California prescribers
Dr. Castillo wrote 29 prescriptions for Ibuprofen, about 69% as often as the typical California prescriber of it (42). Medicare paid $3.50 per fill, versus $6.71 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
Amoxicillin/clavulanic acid is a combination penicillin-type antibiotic used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Castillo wrote 27 prescriptions for Amoxicillin-Clavulanate Potass, about as often as the typical California prescriber of it (26). Medicare paid $4.90 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 medication is a combination of two antibiotics: sulfamethoxazole and trimethoprim.
Compared with California prescribers
Dr. Castillo wrote 26 prescriptions for Sulfamethoxazole-Trimethoprim, about as often as the typical California prescriber of it (25). Medicare paid $2.55 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.
What it is used for
See also Warning section.
Compared with California prescribers
Dr. Castillo wrote 25 prescriptions for Diclofenac Sodium, about half as often as the typical California prescriber of it (47). Medicare paid $4.46 per fill, versus $107.23 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
This medication is used to treat a variety of bacterial infections.
Compared with California prescribers
Dr. Castillo wrote 22 prescriptions for Ciprofloxacin Hcl, about 73% as often as the typical California prescriber of it (30). Medicare paid $3.22 per fill, versus $6.32 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 alone or with other medications to prevent nausea and vomiting caused by cancer drug treatment (chemotherapy) and radiation therapy.
Compared with California prescribers
Dr. Castillo wrote 22 prescriptions for Ondansetron Odt, about 89% as often as the typical California prescriber of it (25). Medicare paid $5.64 per fill, versus $13.40 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
Albuterol (also known as salbutamol) is used to prevent and treat wheezing and shortness of breath caused by breathing problems (such as asthma, chronic obstructive pulmonary disease).
Compared with California prescribers
Dr. Castillo wrote 21 prescriptions for Albuterol Sulfate Hfa, about 36% as often as the typical California prescriber of it (58). Medicare paid $16.76 per fill, versus $28.70 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
See also Warning section.
Compared with California prescribers
Dr. Castillo wrote 14 prescriptions for Naproxen, about half as often as the typical California prescriber of it (29). Medicare paid $5.42 per fill, versus $9.70 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 medication is used to treat eye infections.
Compared with California prescribers
Dr. Castillo wrote 14 prescriptions for Ofloxacin, about 26% as often as the typical California prescriber of it (55). Medicare paid $13.72 per fill, versus $15.84 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 is used to treat a wide variety of bacterial infections.
Compared with California prescribers
Dr. Castillo wrote 12 prescriptions for Amoxicillin, about 31% as often as the typical California prescriber of it (38). Medicare paid $1.24 per fill, versus $4.15 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
Fluconazole is used to treat vaginal yeast infections.
Compared with California prescribers
Dr. Castillo wrote 11 prescriptions for Fluconazole, about half as often as the typical California prescriber of it (21). Medicare paid $2.97 per fill, versus $17.16 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
Fluticasone is used to relieve seasonal and year-round allergic and non-allergic nasal symptoms, such as stuffy/runny nose, itching, and sneezing.
Compared with California prescribers
Dr. Castillo wrote 11 prescriptions for Fluticasone Propionate, about 22% as often as the typical California prescriber of it (50). Medicare paid $7.80 per fill, versus $15.10 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. Castillo’s prescriptions
What does Dr. Castillo prescribe most?
In 2024 Medicare Part D data, Dr. Castillo's most prescribed medications were Prednisone (91), Azithromycin (48) and Cephalexin (39).
How does Dr. Castillo's prescribing compare with other California prescribers?
Of the 15 medications with a state comparison, Dr. Castillo prescribes 3 more often than the typical California prescriber, 3 about as often and 9 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Castillo 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.
