Healthcare provider profile · identity verified

David Randall Castor, M.D.

Family Practice · BRYSON CITY, NC · NPI 1073735155

Profile state: partd only Open Payments: 2025 Medicare Part D: 2024 Last identity check: 2026-08-10 Page data build: 2026-08-12

Verified facts

What the public records show

We did not find matching Open Payments records for this doctor in 2025.

These records do not establish that a payment influenced prescribing or medical care.

Payment overview · 2025

General Payments

We did not find matching Open Payments records for this doctor in the selected program year.

Separate record types

Research & Ownership

Research Payments (direct recipient): not present in the loaded data

Associated Research Funding (for example, named PI): not present in the loaded data

Ownership / Investment: not present in the loaded data

These categories are never added into the General Payments headline. Associated research funding must not be described as money the doctor personally received unless the source record supports that conclusion.

Analysis 1 · Payment-linked products

Products named in Open Payments records

No payment-linked product analysis is available because no matching General Payment records were found for the selected year.

Public prescribing for products named in payments

There is no explicit payment-product set available for a Part D comparison.

The presence of the same drug in both datasets does not show that a payment caused or influenced a prescription.

Analysis 2 · Same-company prescribing overlap

Drugs reported in other payments from the same company that also appear in Medicare Part D

This analysis is independent from products named on this doctor’s individual payment records. A row appears only when the exact Open Payments reporting entity paid this doctor, that same reporting entity reported the drug or biological on at least 10 loaded General Payment records involving at least 2 distinct recipient NPIs, and this doctor has the same non-generic brand in public Part D data. This does not mean the company owns or manufactures the drug.

There is no payer-company set available for this comparison.

These facts do not show that a payment was for the drug, that the company owns or manufactures the drug, or that a payment caused or influenced prescribing.

Public Medicare Part D data

Provider-and-drug rows loaded for 2024

Brand	Generic	Claims	Beneficiaries
Atorvastatin Calcium	Atorvastatin Calcium	899	103
Gabapentin	Gabapentin	828	72
Furosemide	Furosemide	806	90
Amlodipine Besylate	Amlodipine Besylate	715	83
Levothyroxine Sodium	Levothyroxine Sodium	695	65
Eliquis	Apixaban	659	69
Sertraline Hcl	Sertraline Hcl	572	56
Omeprazole	Omeprazole	495	43
Metoprolol Tartrate	Metoprolol Tartrate	493	46
Lisinopril	Lisinopril	439	41
Pantoprazole Sodium	Pantoprazole Sodium	432	65
Tamsulosin Hcl	Tamsulosin Hcl	418	55
Potassium Chloride	Potassium Chloride	410	46
Carvedilol	Carvedilol	384	38
Losartan Potassium	Losartan Potassium	376	55
Trazodone Hcl	Trazodone Hcl	368	44
Clopidogrel	Clopidogrel Bisulfate	341	31
Metoprolol Succinate	Metoprolol Succinate	319	38
Quetiapine Fumarate	Quetiapine Fumarate	279	31
Prednisone	Prednisone	277	187
Memantine Hcl	Memantine Hcl	270	31
Levetiracetam	Levetiracetam	260	30
Duloxetine Hcl	Duloxetine Hcl	241	18
Metformin Hcl	Metformin Hcl	237	33
Donepezil Hcl	Donepezil Hcl	233	32
Mirtazapine	Mirtazapine	229	37
Rosuvastatin Calcium	Rosuvastatin Calcium	212	28
Famotidine	Famotidine	203	35
Simvastatin	Simvastatin	196	17
Meloxicam	Meloxicam	183	30
Pravastatin Sodium	Pravastatin Sodium	182	27
Finasteride	Finasteride	174	20
Xarelto	Rivaroxaban	170	13
Allopurinol	Allopurinol	169	19
Cefdinir	Cefdinir	168	153
Citalopram Hbr	Citalopram Hydrobromide	165	21
Divalproex Sodium	Divalproex Sodium	161	24
Hydralazine Hcl	Hydralazine Hcl	160	28
Midodrine Hcl	Midodrine Hcl	152	19
Escitalopram Oxalate	Escitalopram Oxalate	144	22
Isosorbide Mononitrate Er	Isosorbide Mononitrate	132	15
Spironolactone	Spironolactone	132	16
Azithromycin	Azithromycin	130	118
Tramadol Hcl	Tramadol Hcl	123	26
Buspirone Hcl	Buspirone Hcl	121	18
Bupropion Xl	Bupropion Hcl	120	12
Carbidopa-Levodopa	Carbidopa/Levodopa	117	suppressed
Lorazepam	Lorazepam	104	27
Olanzapine	Olanzapine	102	12
Megestrol Acetate	Megestrol Acetate	100	23
Jardiance	Empagliflozin	99	suppressed
Ciprofloxacin Hcl	Ciprofloxacin Hcl	95	74
Baclofen	Baclofen	94	13
Hydrocodone-Acetaminophen	Hydrocodone/Acetaminophen	94	24
Sulfamethoxazole-Trimethoprim	Sulfamethoxazole/Trimethoprim	92	67
Lacosamide	Lacosamide	91	suppressed
Sucralfate	Sucralfate	91	24
Montelukast Sodium	Montelukast Sodium	88	14
Methocarbamol	Methocarbamol	86	26
Alprazolam	Alprazolam	80	21
Hydrochlorothiazide	Hydrochlorothiazide	79	13
Myrbetriq	Mirabegron	79	suppressed
Gemfibrozil	Gemfibrozil	77	suppressed
Lantus Solostar	Insulin Glargine,hum.Rec.Anlog	76	19
Ibuprofen	Ibuprofen	72	19
Oxybutynin Chloride Er	Oxybutynin Chloride	71	suppressed
Oxycodone Hcl	Oxycodone Hcl	70	14
Latanoprost	Latanoprost	68	17
Risperidone	Risperidone	68	suppressed
Fluticasone Propionate	Fluticasone Propionate	61	26
Amiodarone Hcl	Amiodarone Hcl	60	13
Fluoxetine Hcl	Fluoxetine Hcl	60	13
Felodipine Er	Felodipine	59	suppressed
Nifedipine Er	Nifedipine	59	15
Hydroxychloroquine Sulfate	Hydroxychloroquine Sulfate	58	suppressed
Digoxin	Digoxin	57	12
Abrysvo	Rsv Vacc, Pref A And Pref B/Pf	56	54
Albuterol Sulfate Hfa	Albuterol Sulfate	56	39
Ondansetron Hcl	Ondansetron Hcl	56	34
Cephalexin	Cephalexin	55	32
Triamcinolone Acetonide	Triamcinolone Acetonide	55	43
Doxycycline Hyclate	Doxycycline Hyclate	54	19
Hydroxyzine Pamoate	Hydroxyzine Pamoate	53	16
Scopolamine	Scopolamine	53	12
Fiasp Flextouch	Insulin Aspart (Niacinamide)	52	suppressed
Pregabalin	Pregabalin	52	suppressed
Basaglar Kwikpen U-100	Insulin Glargine,hum.Rec.Anlog	51	11
Primidone	Primidone	51	suppressed
Amoxicillin-Clavulanate Potass	Amoxicillin/Potassium Clav	50	32
Valproic Acid	Valproic Acid (As Sodium Salt)	50	suppressed
Atenolol	Atenolol	49	suppressed
Farxiga	Dapagliflozin Propanediol	49	suppressed
Fenofibrate	Fenofibrate Nanocrystallized	49	suppressed
Isosorbide Dinitrate	Isosorbide Dinitrate	49	suppressed
Glipizide	Glipizide	48	suppressed
Solifenacin Succinate	Solifenacin Succinate	47	suppressed
Humalog	Insulin Lispro	46	suppressed
Celecoxib	Celecoxib	45	suppressed
Diclofenac Sodium	Diclofenac Sodium	45	18
Clonazepam	Clonazepam	42	suppressed
Gemtesa	Vibegron	42	suppressed
Levemir Flexpen	Insulin Detemir	42	suppressed
Prazosin Hcl	Prazosin Hcl	42	suppressed
Linzess	Linaclotide	40	suppressed
Methenamine Hippurate	Methenamine Hippurate	40	suppressed
Lactulose	Lactulose	39	12
Metoclopramide Hcl	Metoclopramide Hcl	39	suppressed
Nitrofurantoin Mono-Macro	Nitrofurantoin Monohyd/M-Cryst	39	12
Ipratropium-Albuterol	Ipratropium/Albuterol Sulfate	38	16
Levofloxacin	Levofloxacin	38	28
Torsemide	Torsemide	38	suppressed
Brimonidine Tartrate	Brimonidine Tartrate	37	suppressed
Doxazosin Mesylate	Doxazosin Mesylate	37	suppressed
Roflumilast	Roflumilast	37	suppressed
Lantus	Insulin Glargine,hum.Rec.Anlog	36	suppressed
Clonidine Hcl	Clonidine Hcl	35	suppressed
Divalproex Sodium Er	Divalproex Sodium	35	suppressed
Cimetidine	Cimetidine	33	suppressed
Nystatin	Nystatin	33	18
Paroxetine Hcl	Paroxetine Hcl	33	suppressed
Trelegy Ellipta	Fluticasone/Umeclidin/Vilanter	33	suppressed
Metformin Hcl Er	Metformin Hcl	32	suppressed
Novolog Flexpen	Insulin Aspart	32	suppressed
Phenytoin Sodium Extended	Phenytoin Sodium Extended	32	suppressed
Meclizine Hcl	Meclizine Hcl	31	13
Autoshield Duo Pen Needle	Pen Needle,dual Safety,diabetc	29	suppressed
Fluticasone-Salmeterol	Fluticasone Propion/Salmeterol	29	suppressed
Insulin Aspart Flexpen	Insulin Aspart	29	suppressed
Advair Hfa	Fluticasone Propion/Salmeterol	28	suppressed
Dapagliflozin	Dapagliflozin Propanediol	28	suppressed
Lidocaine	Lidocaine	28	suppressed
Bisoprolol Fumarate	Bisoprolol Fumarate	27	suppressed
Doxepin Hcl	Doxepin Hcl	27	suppressed
Oxcarbazepine	Oxcarbazepine	27	suppressed
Pioglitazone Hcl	Pioglitazone Hcl	27	suppressed
Propranolol Hcl	Propranolol Hcl	27	suppressed
Chlorthalidone	Chlorthalidone	26	suppressed
Cilostazol	Cilostazol	26	suppressed
Diltiazem 24hr Er (Cd)	Diltiazem Hcl	26	suppressed
Nuedexta	Dextromethorphan Hbr/Quinidine	26	suppressed
Ondansetron Odt	Ondansetron	26	25
Fentanyl	Fentanyl	25	suppressed
Insulin Lispro	Insulin Lispro	25	12
Ozempic	Semaglutide	25	suppressed
Valsartan	Valsartan	25	suppressed
Austedo	Deutetrabenazine	24	suppressed
Esomeprazole Magnesium	Esomeprazole Magnesium	24	suppressed
Ketoconazole	Ketoconazole	24	14
Restasis	Cyclosporine	24	suppressed
Anoro Ellipta	Umeclidinium Brm/Vilanterol Tr	23	suppressed
Benztropine Mesylate	Benztropine Mesylate	23	suppressed
Enalapril Maleate	Enalapril Maleate	23	suppressed
Irbesartan	Irbesartan	23	suppressed
Venlafaxine Hcl Er	Venlafaxine Hcl	23	suppressed
Dexlansoprazole Dr	Dexlansoprazole	22	suppressed
Fiasp	Insulin Aspart (Niacinamide)	22	suppressed
Methylprednisolone	Methylprednisolone	22	21
Azelastine Hcl	Azelastine Hcl	21	suppressed
Fluconazole	Fluconazole	21	16
Hydroxyurea	Hydroxyurea	21	suppressed
Hydroxyzine Hcl	Hydroxyzine Hcl	21	suppressed
Liothyronine Sodium	Liothyronine Sodium	21	suppressed
Metolazone	Metolazone	21	suppressed
Motegrity	Prucalopride Succinate	21	suppressed
Amitriptyline Hcl	Amitriptyline Hcl	20	suppressed
Dorzolamide-Timolol	Dorzolamide Hcl/Timolol Maleat	20	suppressed
Insulin Glargine-Yfgn	Insulin Glargine-Yfgn	20	suppressed
Novolin 70-30	Insulin Nph Hum/Reg Insulin Hm	20	suppressed
Ranolazine Er	Ranolazine	20	suppressed
Venlafaxine Hcl	Venlafaxine Hcl	20	suppressed
Alendronate Sodium	Alendronate Sodium	19	suppressed
Cyclobenzaprine Hcl	Cyclobenzaprine Hcl	19	suppressed
Doxycycline Monohydrate	Doxycycline Monohydrate	19	19
Haloperidol	Haloperidol	19	suppressed
Misoprostol	Misoprostol	19	suppressed
Acetazolamide	Acetazolamide	18	suppressed
Admelog	Insulin Lispro	18	suppressed
Amoxicillin	Amoxicillin	18	11
Bumetanide	Bumetanide	18	suppressed
Bupropion Hcl	Bupropion Hcl	18	suppressed
Bupropion Hcl Sr	Bupropion Hcl	18	suppressed
Chlorhexidine Gluconate	Chlorhexidine Gluconate	18	suppressed
Entresto	Sacubitril/Valsartan	18	suppressed
Lithium Carbonate	Lithium Carbonate	18	suppressed
Sumatriptan Succinate	Sumatriptan Succinate	18	suppressed
Trihexyphenidyl Hcl	Trihexyphenidyl Hcl	18	suppressed
Dexamethasone	Dexamethasone	17	suppressed
Hydrocortisone	Hydrocortisone	17	suppressed
Nyamyc	Nystatin	17	suppressed
Rivastigmine	Rivastigmine Tartrate	17	suppressed
Sps	Sodium Polystyrene Sulfon/Sorb	17	suppressed
Tivicay	Dolutegravir Sodium	17	suppressed
Amantadine	Amantadine Hcl	16	suppressed
Breo Ellipta	Fluticasone/Vilanterol	16	suppressed
Calcium Acetate	Calcium Acetate	16	suppressed
Levemir	Insulin Detemir	16	suppressed
Dutasteride	Dutasteride	15	suppressed
Haloperidol Decanoate	Haloperidol Decanoate	15	suppressed
Insulin Lispro Kwikpen U-100	Insulin Lispro	15	suppressed
Isosorbide Mononitrate	Isosorbide Mononitrate	15	suppressed
Lamotrigine	Lamotrigine	15	suppressed
Ofloxacin	Ofloxacin	15	14
Sevelamer Hcl	Sevelamer Hcl	15	suppressed
Tizanidine Hcl	Tizanidine Hcl	15	suppressed
Topiramate	Topiramate	15	suppressed
Trulicity	Dulaglutide	15	suppressed
Aripiprazole	Aripiprazole	14	suppressed
Diazepam	Diazepam	14	suppressed
Insulin Aspart	Insulin Aspart	14	suppressed
Metronidazole	Metronidazole	14	11
Oxybutynin Chloride	Oxybutynin Chloride	14	suppressed
Phenobarbital	Phenobarbital	14	suppressed
Silodosin	Silodosin	14	suppressed
Tresiba Flextouch U-200	Insulin Degludec	14	suppressed
Albuterol Sulfate	Albuterol Sulfate	13	suppressed
Butrans	Buprenorphine	13	suppressed
Combivent Respimat	Ipratropium/Albuterol Sulfate	13	suppressed
Dofetilide	Dofetilide	13	suppressed
Glimepiride	Glimepiride	13	suppressed
Incruse Ellipta	Umeclidinium Bromide	13	suppressed
Invega Sustenna	Paliperidone Palmitate	13	suppressed
Levetiracetam Er	Levetiracetam	13	suppressed
Lithium Carbonate Er	Lithium Carbonate	13	suppressed
Oxycodone-Acetaminophen	Oxycodone Hcl/Acetaminophen	13	suppressed
Ropinirole Hcl	Ropinirole Hcl	13	suppressed
Terazosin Hcl	Terazosin Hcl	13	suppressed
Benazepril Hcl	Benazepril Hcl	12	suppressed
Diltiazem Hcl	Diltiazem Hcl	12	suppressed
Enulose	Lactulose	12	suppressed
Formoterol Fumarate	Formoterol Fumarate	12	suppressed
Lidocaine Hcl Viscous	Lidocaine Hcl	12	suppressed
Mesalamine	Mesalamine	12	suppressed
Mometasone Furoate	Mometasone Furoate	12	suppressed
Morphine Sulfate	Morphine Sulfate	12	suppressed
Polymyxin B Sul-Trimethoprim	Polymyxin B Sulf/Trimethoprim	12	11
Verapamil Er	Verapamil Hcl	12	suppressed
Diltiazem 24hr Er (La)	Diltiazem Hcl	11	suppressed
Enoxaparin Sodium	Enoxaparin Sodium	11	suppressed
Humalog Kwikpen U-100	Insulin Lispro	11	suppressed
Ingrezza	Valbenazine Tosylate	11	suppressed
Lisinopril-Hydrochlorothiazide	Lisinopril/Hydrochlorothiazide	11	suppressed
Methotrexate	Methotrexate Sodium	11	suppressed
Potassium Citrate Er	Potassium Citrate	11	suppressed
Raloxifene Hcl	Raloxifene Hcl	11	suppressed

Timeline

Payment and prescribing data by year

Open Payments and Medicare Part D may refer to different years. They are shown separately rather than aligned as if they describe the same period.

Year	General Payments	Main payer	Explicit products	Company overlaps	Part D coverage
2025	—	—	—	—	—
2024	—	—	—	—	Complete

Questions to ask

Questions you could discuss with your doctor

Are there reasonable alternatives I should understand when we discuss treatment options?
How should I interpret the industry-payment records shown here in the context of my care?

These are general questions generated from reviewed templates. They are not personalized medical advice.

Sources and limitations

How to read this page

Payment and Medicare prescribing data can cover different years; every comparison shows both years explicitly.
Part D does not represent a doctor’s entire practice; it excludes many patients and is subject to CMS public-release thresholds.
Company–drug relationships must have an auditable source, a precise relationship type, and a valid evidence period. Unresolved mappings are not published.
Generic drug claims are not attributed to a specific manufacturer without manufacturer-level evidence.
When a source extract is incomplete, missing rows are never treated as proof of no payments or no prescriptions.

Loaded source releases

Dataset	Year	Publication	Source
CMS Open Payments — General Payments	2025	2026-06-30	Original source
Medicare Part D Prescribers by Provider and Drug	2024	2026-05-06	Original source
NPPES Data Dissemination V2	current / reference data	2026-08-10	Original source

Methodology version: 2.1

Editorial template version: 2.4

Product contract version: 2.0

Schema version: 0.7.0

Page data build: 2026-08-12T23:34:59.370714+00:00

Publication policy: eligible for indexing after public-launch controls are enabled

Full methodology · Questions & answers · Report a possible error