CLAY F ISTRE PA-C
Prescription History 1811214521
Physician Assistant in San Antonio, TX

Active since April 21, 2010PECOS Enrolled
16755 HUEBNER RD, SAN ANTONIO, TX 78248(210) 493-4357(210) 493-4355 Get Directions

NPPES record last updated: June 26, 2015. Verified against the NPPES registry weekly; last sync: August 09, 2026.

Medicare Part D Prescription History

Explore the verified Medicare Part D prescription history, volume metrics, and calculated drug costs for CLAY F ISTRE PA-C, an active Physician Assistant specialist practicing in San Antonio, TX. Our medical registry currently tracks 11 unique pharmaceutical formulations prescribed by this provider, representing an estimated volume of 328 documented patient claims. Among these therapy options, the most frequently utilized medication is Tramadol Hcl, which accounts for 55 claims alone. Use the table below to sort by claims, cost, or utilization compared with the state average; select any medication for its full profile.

11
Medications
328
Total Claims
332
30-Day Fills
Tramadol Hcl
Most Prescribed · 55 claims
View details
11 medications · 2023 Medicare Part D
Medicare Part D medications prescribed by CLAY F ISTRE PA-C in 2023, with prescription volumes, average cost per fill, and TX state comparisons
Medication Prescriptions (2023)Rx (2023) Avg Cost per FillCost / Fill Vs. Other TX PrescribersVs. TX Avg

About Tramadol Hcl: See also Warning section. Show more ▾

This medication is used to help relieve moderate to moderately severe pain. Tramadol belongs to a class of drugs known as opioid analgesics. It works in the brain to change how your body feels and responds to pain. A narcotic analgesic proposed for severe pain. It may be habituating.

In 2023, this provider wrote 55 Medicare prescriptions for Tramadol Hcl, about 89% of the volume of the typical Texas prescriber of this medication (62). Medicare paid an average of $1.74 per fill, versus $7.68 statewide.

How often this provider prescribes it

This provider
55
TX average
62.0

This provider's prescribing volume for this medication is in line with the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$1.74
TX average
$7.68

This provider's average cost per fill is below the TX average for this medication.

55
30-Day Fills
standardized to 30-day supplies
237
Days of Medication
total across all patients in 2023

About Acetaminophen-Codeine: See also Warning section. Show more ▾

This combination medication is used to help relieve mild to moderate pain. It contains an opioid pain reliever (codeine) and a non-opioid pain reliever (acetaminophen). Codeine works in the brain to change how your body feels and responds to pain. Acetaminophen can also reduce a fever.

In 2023, this provider wrote 47 Medicare prescriptions for Acetaminophen-Codeine, about the same volume as the typical Texas prescriber of this medication (44). Medicare paid an average of $3.26 per fill, versus $18.55 statewide.

How often this provider prescribes it

This provider
47
TX average
44.0

This provider's prescribing volume for this medication is in line with the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$3.26
TX average
$18.55

This provider's average cost per fill is below the TX average for this medication.

47
30-Day Fills
standardized to 30-day supplies
176
Days of Medication
total across all patients in 2023

About Cyclobenzaprine Hcl: Cyclobenzaprine is used short-term to treat muscle spasms. Show more ▾

It is usually used along with rest and physical therapy. It works by helping to relax the muscles. This medication is not recommended for use in older adults because they may be at greater risk for side effects while using this drug. Ask the doctor or pharmacist for details.

In 2023, this provider wrote 46 Medicare prescriptions for Cyclobenzaprine Hcl, about 1.3 times the volume of the typical Texas prescriber of this medication (36). Medicare paid an average of $3.49 per fill, versus $16.21 statewide.

How often this provider prescribes it

This provider
46
TX average
36.0

This provider prescribes this medication more often than the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$3.49
TX average
$16.21

This provider's average cost per fill is below the TX average for this medication.

46
30-Day Fills
standardized to 30-day supplies
311
Days of Medication
total across all patients in 2023

About Methylprednisolone: Methylprednisolone is used to treat conditions such as arthritis, blood disorders, severe allergic reactions, certain cancers, eye conditions, skin/kidney/intestinal/lung diseases, and immune system disorders. Show more ▾

It decreases your immune system's response to various diseases to reduce symptoms such as swelling, pain, and allergic-type reactions. This medication is a corticosteroid hormone. Methylprednisolone may also be used with other medications in hormone disorders. A PREDNISOLONE derivative with similar anti-inflammatory action.

In 2023, this provider wrote 39 Medicare prescriptions for Methylprednisolone, about the same volume as the typical Texas prescriber of this medication (35). Medicare paid an average of $8.76 per fill, versus $10.10 statewide.

How often this provider prescribes it

This provider
39
TX average
35.0

This provider's prescribing volume for this medication is in line with the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$8.76
TX average
$10.10

This provider's average cost per fill is below the TX average for this medication.

39
30-Day Fills
standardized to 30-day supplies
233
Days of Medication
total across all patients in 2023

About Cephalexin: This medication is used to treat a wide variety of bacterial infections. Show more ▾

This medication is known as a cephalosporin antibiotic. It works by stopping the growth of bacteria. This medication will not work for viral infections (such as common cold, flu). Unnecessary use or misuse of any antibiotic can lead to its decreased effectiveness. A semisynthetic cephalosporin antibiotic with antimicrobial activity similar to that of CEPHALORIDINE or CEPHALOTHIN, but somewhat less potent. It is effective against both gram-positive and gram-negative organisms.

In 2023, this provider wrote 38 Medicare prescriptions for Cephalexin, about 1.3 times the volume of the typical Texas prescriber of this medication (29). Medicare paid an average of $5.91 per fill, versus $9.13 statewide.

How often this provider prescribes it

This provider
38
TX average
29.0

This provider prescribes this medication more often than the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$5.91
TX average
$9.13

This provider's average cost per fill is below the TX average for this medication.

38
30-Day Fills
standardized to 30-day supplies
230
Days of Medication
total across all patients in 2023

About Amoxicillin-Clavulanate Potass: Amoxicillin/clavulanic acid is a combination penicillin-type antibiotic used to treat a wide variety of bacterial infections. Show more ▾

It works by stopping the growth of bacteria. This antibiotic treats only bacterial infections. It will not work for viral infections (such as common cold, flu). Using any antibiotic when it is not needed can cause it to not work for future infections. A fixed-ratio combination of amoxicillin trihydrate and potassium clavulanate.

In 2023, this provider wrote 25 Medicare prescriptions for Amoxicillin-Clavulanate Potass, about the same volume as the typical Texas prescriber of this medication (27). Medicare paid an average of $14.93 per fill, versus $13.74 statewide.

How often this provider prescribes it

This provider
25
TX average
27.0

This provider's prescribing volume for this medication is in line with the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$14.93
TX average
$13.74

Gross Part D cost per fill; not the patient's out-of-pocket price.

25
30-Day Fills
standardized to 30-day supplies
239
Days of Medication
total across all patients in 2023

About Ondansetron Odt: This medication is used alone or with other medications to prevent nausea and vomiting caused by cancer drug treatment (chemotherapy) and radiation therapy. Show more ▾

It is also used to prevent and treat nausea and vomiting after surgery. Ondansetron works by blocking one of the body's natural substances (serotonin) that causes vomiting. A competitive serotonin type 3 receptor antagonist. It is effective in the treatment of nausea and vomiting caused by cytotoxic chemotherapy drugs, including cisplatin, and has reported anxiolytic and neuroleptic properties.

In 2023, this provider wrote 22 Medicare prescriptions for Ondansetron Odt, about the same volume as the typical Texas prescriber of this medication (24). Medicare paid an average of $10.27 per fill, versus $22.90 statewide.

How often this provider prescribes it

This provider
22
TX average
24.0

This provider's prescribing volume for this medication is in line with the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$10.27
TX average
$22.90

This provider's average cost per fill is below the TX average for this medication.

22
30-Day Fills
standardized to 30-day supplies
138
Days of Medication
total across all patients in 2023

About Tizanidine Hcl: This medication is used to treat muscle spasms caused by certain conditions (such as multiple sclerosis, spinal cord injury). Show more ▾

It works by helping to relax the muscles.

In 2023, this provider wrote 18 Medicare prescriptions for Tizanidine Hcl, about a third of the volume of the typical Texas prescriber of this medication (55). Medicare paid an average of $3.21 per fill, versus $14.41 statewide.

How often this provider prescribes it

This provider
18
TX average
55.0

This provider prescribes this medication less often than the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$3.21
TX average
$14.41

This provider's average cost per fill is below the TX average for this medication.

18
30-Day Fills
standardized to 30-day supplies
123
Days of Medication
total across all patients in 2023

About Albuterol Sulfate Hfa: Albuterol (also known as salbutamol) is used to treat wheezing and shortness of breath caused by breathing problems such as asthma. Show more ▾

It is a quick-relief medication. Albuterol belongs to a class of drugs known as bronchodilators. It works by relaxing the muscles around the airways so that they open up and you can breathe more easily. Controlling symptoms of breathing problems can decrease time lost from work or school. A short-acting beta-2 adrenergic agonist that is primarily used as a bronchodilator agent to treat ASTHMA. Albuterol is prepared as a racemic mixture of R(-) and S(+) stereoisomers. The stereospecific preparation of R(-) isomer of albuterol is referred to as levalbuterol.

In 2023, this provider wrote 14 Medicare prescriptions for Albuterol Sulfate Hfa, about a quarter of the volume of the typical Texas prescriber of this medication (51). Medicare paid an average of $20.96 per fill, versus $49.62 statewide.

How often this provider prescribes it

This provider
14
TX average
51.0

This provider prescribes this medication less often than the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$20.96
TX average
$49.62

This provider's average cost per fill is below the TX average for this medication.

17.9
30-Day Fills
standardized to 30-day supplies
491
Days of Medication
total across all patients in 2023

About Clindamycin Hcl: Clindamycin is used to treat a wide variety of bacterial infections. Show more ▾

It is an antibiotic that works by stopping the growth of bacteria. This antibiotic treats only bacterial infections. It will not work for virus infections (such as common cold, flu). Using any antibiotic when it is not needed can cause it to not work for future infections. An antibacterial agent that is a semisynthetic analog of LINCOMYCIN.

In 2023, this provider wrote 13 Medicare prescriptions for Clindamycin Hcl, about half the volume of the typical Texas prescriber of this medication (22). Medicare paid an average of $9.34 per fill, versus $12.03 statewide.

How often this provider prescribes it

This provider
13
TX average
22.0

This provider prescribes this medication less often than the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$9.34
TX average
$12.03

This provider's average cost per fill is below the TX average for this medication.

13
30-Day Fills
standardized to 30-day supplies
89
Days of Medication
total across all patients in 2023

About Sulfamethoxazole-Trimethoprim: This medication is a combination of two antibiotics: sulfamethoxazole and trimethoprim. Show more ▾

It is used to treat a wide variety of bacterial infections (such as middle ear, urine, respiratory, and intestinal infections). It is also used to prevent and treat a certain type of pneumonia (pneumocystis-type). This medication should not be used by children less than 2 months of age due to the risk of serious side effects. This medication treats only certain types of infections. It will not work for viral infections (such as flu). Unnecessary use or misuse of any antibiotic can lead to its decreased effectiveness. A drug combination with broad-spectrum antibacterial activity against both gram-positive and gram-negative organisms. It is effective in the treatment of many infections, including PNEUMOCYSTIS PNEUMONIA in AIDS.

In 2023, this provider wrote 11 Medicare prescriptions for Sulfamethoxazole-Trimethoprim, about a third of the volume of the typical Texas prescriber of this medication (27). Medicare paid an average of $3.46 per fill, versus $6.17 statewide.

How often this provider prescribes it

This provider
11
TX average
27.0

This provider prescribes this medication less often than the average TX prescriber. Utilization reflects practice size as well as clinical preference.

What Medicare paid per fill

This provider
$3.46
TX average
$6.17

This provider's average cost per fill is below the TX average for this medication.

11
30-Day Fills
standardized to 30-day supplies
74
Days of Medication
total across all patients in 2023
No medications match the current filters.
= the 5 medications this provider prescribes most. More than typical Typical Less than typical= prescription volume vs the average TX prescriber of the same medication; volume reflects practice size as well as clinical preference.Green cost= below the TX average cost per fill.

About this data. The prescription history for CLAY F ISTRE PA-C is compiled from the Centers for Medicare & Medicaid Services (CMS) Medicare Part D Prescriber Public Use File for calendar year 2023, the most recent federal release. Figures cover prescriptions filled for Medicare Part D beneficiaries only; prescriptions under private insurance, Medicaid, or self-pay plans are not included. Because prescribing decisions are generally consistent across coverage types, this record offers a useful view of the overall Physician Assistant prescribing approach at this San Antonio, TX practice.

Reading the costs. Drug costs are gross amounts paid to pharmacies under Part D, including both plan and beneficiary payments. They are not the price a patient pays at the pharmacy counter. Medications with fewer than 11 claims are excluded from the federal source data, and state comparisons use the average volume among TX prescribers of the same medication. Always confirm current medications and costs directly with the provider and your plan.