DR. VISHNU CHALLAPALLI M.D.
Prescription History 1730142944
Psychiatric Unit in Spring, TX
What does Dr. Challapalli prescribe?
In 2024, Dr. Challapalli wrote 258 Medicare prescriptions for 10 medications. The most prescribed was Quetiapine Fumarate, with 58 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. Challapalli 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 Texas prescribers.
What it is used for
This medication is used to treat certain mental/mood disorders (such as schizophrenia, bipolar disorder, sudden episodes of mania or depression associated with bipolar disorder).
Compared with Texas prescribers
Dr. Challapalli wrote 58 prescriptions for Quetiapine Fumarate, about 1.2 times as often as the typical Texas prescriber of it (50). Medicare paid $7.68 per fill, versus $18.12 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 Texas prescribers
Dr. Challapalli wrote 40 prescriptions for Clonazepam, about 84% as often as the typical Texas prescriber of it (48). Medicare paid $9.36 per fill, versus $8.82 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, panic attacks, and social anxiety disorder).
Compared with Texas prescribers
Dr. Challapalli wrote 37 prescriptions for Venlafaxine Hcl Er, about 1.2 times as often as the typical Texas prescriber of it (31). Medicare paid $10.85 per fill, versus $23.06 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 Texas prescribers
Dr. Challapalli wrote 28 prescriptions for Duloxetine Hcl, about half as often as the typical Texas prescriber of it (52). Medicare paid $10.84 per fill, versus $23.99 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, panic attacks, obsessive compulsive disorder).
Compared with Texas prescribers
Dr. Challapalli wrote 22 prescriptions for Fluoxetine Hcl, about half as often as the typical Texas prescriber of it (37). Medicare paid $3.28 per fill, versus $10.79 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 seizure disorders, certain psychiatric conditions (manic phase of bipolar disorder), and to prevent migraine headaches.
Compared with Texas prescribers
Dr. Challapalli wrote 19 prescriptions for Divalproex Sodium, about 31% as often as the typical Texas prescriber of it (62). Medicare paid $11.06 per fill, versus $37.30 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 depression.
Compared with Texas prescribers
Dr. Challapalli wrote 16 prescriptions for Trazodone Hcl, about 24% as often as the typical Texas prescriber of it (67). Medicare paid $4.56 per fill, versus $8.61 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 seizure disorders, mental/mood conditions (such as manic phase of bipolar disorder), and to prevent migraine headaches.
Compared with Texas prescribers
Dr. Challapalli wrote 13 prescriptions for Divalproex Sodium Er, about 35% as often as the typical Texas prescriber of it (38). Medicare paid $14.93 per fill, versus $53.10 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, panic attacks, obsessive compulsive disorder, post-traumatic stress disorder, social anxiety disorder).
Compared with Texas prescribers
Dr. Challapalli wrote 13 prescriptions for Sertraline Hcl, about 22% as often as the typical Texas prescriber of it (59). Medicare paid $6.55 per fill, versus $9.11 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
This medication is used to treat certain mental/mood disorders (such as schizophrenia, bipolar disorder).
Compared with Texas prescribers
Dr. Challapalli wrote 12 prescriptions for Olanzapine, about 28% as often as the typical Texas prescriber of it (42). Medicare paid $4.48 per fill, versus $22.50 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. Challapalli’s prescriptions
What does Dr. Challapalli prescribe most?
In 2024 Medicare Part D data, Dr. Challapalli's most prescribed medications were Quetiapine Fumarate (58), Clonazepam (40) and Venlafaxine Hcl Er (37).
How does Dr. Challapalli's prescribing compare with other Texas prescribers?
Of the 10 medications with a state comparison, Dr. Challapalli prescribes 3 about as often than the typical Texas prescriber and 7 less often. Volume reflects practice size as well as prescribing habits.
Does this list show every medication Dr. Challapalli 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 Texas 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.
