{ "api_version": "1", "request": { "url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Sildenafil+citrate+%28Viagra%29&page=5", "query": { "intervention": "Sildenafil citrate (Viagra)", "page": 5 }, "page_size": 10 }, "pagination": { "page": 5, "page_size": 10, "total_count": 177, "total_pages": 18, "next_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Sildenafil+citrate+%28Viagra%29&page=6&page_size=10", "previous_page_url": "https://clinicaltrialsfind.com/api/v1/search.json?intervention=Sildenafil+citrate+%28Viagra%29&page=4&page_size=10" }, "source": "remote", "last_synced_at": "2026-10-14T11:50:26.222Z", "attribution": "Data derived from public ClinicalTrials.gov records. The official record at https://clinicaltrials.gov/ remains the source of truth for current availability, contacts, and full study details.", "notes": [ "This endpoint exposes only public summary fields — no participant contact emails, phone numbers, or scraped investigator contact details.", "For contact information and full protocol detail, follow each trial's `official_url` to the ClinicalTrials.gov record.", "This API is a navigational aid. It does not provide medical advice, eligibility determinations, or compensation guarantees." ], "trials": [ { "nct_id": "NCT00159874", "title": "A Long Term Extension Study Evaluating Safety Of Sildenafil Citrate When Used To Treat Pulmonary Arterial Hypertension (PAH) In Children", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE3" ], "conditions": [ "Pulmonary Arterial Hypertension" ], "interventions": [ { "name": "Sildenafil citrate", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Pfizer's Upjohn has merged with Mylan to form Viatris Inc.", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "1 Year", "maximum_age": "17 Years", "sex": "ALL", "summary": "1 Year to 17 Years" }, "enrollment_count": 234, "start_date": "2004-01", "completion_date": "2012-12", "has_results": true, "last_update_posted_date": "2021-02-01", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 11, "location_summary": "Palo Alto, California • Stanford, California • Aurora, Colorado + 7 more", "locations": [ { "city": "Palo Alto", "state": "California" }, { "city": "Palo Alto", "state": "California" }, { "city": "Stanford", "state": "California" }, { "city": "Aurora", "state": "Colorado" }, { "city": "Boston", "state": "Massachusetts" } ], "official_url": "https://clinicaltrials.gov/study/NCT00159874" }, { "nct_id": "NCT00796666", "title": "Study Looking at Combination Therapy (Sitaxsentan+Sildenafil) Vs. Monotherapy (Sitaxsentan Alone) SR-PAAS -Sitaxsentan Efficacy And Safety Trial With A Randomized Prospective Assessment Of Adding Sildenafil", "overall_status": "TERMINATED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE3" ], "conditions": [ "Pulmonary Arterial Hypertension", "Pulmonary Hypertension" ], "interventions": [ { "name": "Sitaxsentan", "type": "DRUG" }, { "name": "Sitaxsentan and Sildenafil", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Pfizer", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "16 Years", "maximum_age": "80 Years", "sex": "ALL", "summary": "16 Years to 80 Years" }, "enrollment_count": 131, "start_date": "2009-05", "completion_date": "2011-03", "has_results": true, "last_update_posted_date": "2015-03-24", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 12, "location_summary": "Fountain Valley, California • Gainesville, Florida • Weston, Florida + 9 more", "locations": [ { "city": "Fountain Valley", "state": "California" }, { "city": "Gainesville", "state": "Florida" }, { "city": "Weston", "state": "Florida" }, { "city": "Boston", "state": "Massachusetts" }, { "city": "Omaha", "state": "Nebraska" } ], "official_url": "https://clinicaltrials.gov/study/NCT00796666" }, { "nct_id": "NCT03382106", "title": "Smoking Cessation and Functional CT Assessment", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE4" ], "conditions": [ "Emphysema" ], "interventions": [ { "name": "Sildenafil 20 MG", "type": "DRUG" }, { "name": "Placebo Oral Tablet", "type": "DRUG" }, { "name": "Pulse wave velocity", "type": "DIAGNOSTIC_TEST" }, { "name": "Carotid artery compliance and stiffness", "type": "DIAGNOSTIC_TEST" }, { "name": "Pressure wave reflection", "type": "DIAGNOSTIC_TEST" } ], "intervention_types": [ "DRUG", "DIAGNOSTIC_TEST" ], "sponsor": "Eric A. Hoffman", "sponsor_class": "OTHER", "healthy_volunteers": true, "eligibility": { "minimum_age": "21 Years", "maximum_age": "65 Years", "sex": "ALL", "summary": "21 Years to 65 Years" }, "enrollment_count": 162, "start_date": "2018-03-19", "completion_date": "2024-09-24", "has_results": false, "last_update_posted_date": "2025-02-14", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 1, "location_summary": "Iowa City, Iowa", "locations": [ { "city": "Iowa City", "state": "Iowa" } ], "official_url": "https://clinicaltrials.gov/study/NCT03382106" }, { "nct_id": "NCT01179334", "title": "Evaluation of the Pharmacodynamic Effect of the Combination of Sildenafil and Riociguat on Blood Pressure and Other Safety Parameters.", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Pulmonary Hypertension" ], "interventions": [ { "name": "Riociguat (Adempas, BAY63-2521)", "type": "DRUG" }, { "name": "Placebo", "type": "DRUG" }, { "name": "Sildenafil", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Bayer", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "18 Years", "maximum_age": "75 Years", "sex": "ALL", "summary": "18 Years to 75 Years" }, "enrollment_count": 18, "start_date": "2010-08", "completion_date": "2013-05", "has_results": true, "last_update_posted_date": "2016-08-29", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 3, "location_summary": "Aurora, Colorado • Columbus, Ohio • Providence, Rhode Island", "locations": [ { "city": "Aurora", "state": "Colorado" }, { "city": "Columbus", "state": "Ohio" }, { "city": "Providence", "state": "Rhode Island" } ], "official_url": "https://clinicaltrials.gov/study/NCT01179334" }, { "nct_id": "NCT00159913", "title": "A Randomized, Double-Blind, Placebo-Controlled Study of Sildenafil in Children With Pulmonary Arterial Hypertension.", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE3" ], "conditions": [ "Pulmonary Arterial Hypertension, Children" ], "interventions": [ { "name": "Sildenafil citrate", "type": "DRUG" }, { "name": "Placebo", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Pfizer's Upjohn has merged with Mylan to form Viatris Inc.", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "1 Year", "maximum_age": "17 Years", "sex": "ALL", "summary": "1 Year to 17 Years" }, "enrollment_count": 235, "start_date": "2003-08", "completion_date": "2008-06", "has_results": true, "last_update_posted_date": "2021-02-18", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 10, "location_summary": "Palo Alto, California • Stanford, California • Aurora, Colorado + 7 more", "locations": [ { "city": "Palo Alto", "state": "California" }, { "city": "Stanford", "state": "California" }, { "city": "Aurora", "state": "Colorado" }, { "city": "Boston", "state": "Massachusetts" }, { "city": "Ann Arbor", "state": "Michigan" } ], "official_url": "https://clinicaltrials.gov/study/NCT00159913" }, { "nct_id": "NCT02570282", "title": "Study to Evaluate the Efficacy and Safety of SST-6007, a Topical Sildenafil Cream, Compared to Placebo in Women With Female Sexual Arousal Disorder", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE2" ], "conditions": [ "Sexual Arousal Disorder" ], "interventions": [ { "name": "Placebo", "type": "DRUG" }, { "name": "SST-6007", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Strategic Science & Technologies, LLC", "sponsor_class": "INDUSTRY", "healthy_volunteers": false, "eligibility": { "minimum_age": "21 Years", "maximum_age": "60 Years", "sex": "FEMALE", "summary": "21 Years to 60 Years · Female only" }, "enrollment_count": 31, "start_date": "2015-09", "completion_date": "2017-07", "has_results": false, "last_update_posted_date": "2017-10-03", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 1, "location_summary": "Austin, Texas", "locations": [ { "city": "Austin", "state": "Texas" } ], "official_url": "https://clinicaltrials.gov/study/NCT02570282" }, { "nct_id": "NCT01290484", "title": "A Study to Evaluate Sildenafil for the Treatment of Lymphatic Malformations", "overall_status": "COMPLETED", "study_type": "INTERVENTIONAL", "phases": [ "PHASE1", "PHASE2" ], "conditions": [ "Lymphangioma" ], "interventions": [ { "name": "Sildenafil", "type": "DRUG" } ], "intervention_types": [ "DRUG" ], "sponsor": "Stanford University", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "6 Months", "maximum_age": "10 Years", "sex": "ALL", "summary": "6 Months to 10 Years" }, "enrollment_count": 7, "start_date": "2010-12", "completion_date": "2013-12", "has_results": true, "last_update_posted_date": "2015-06-19", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 1, "location_summary": "Stanford, California", "locations": [ { "city": "Stanford", "state": "California" } ], "official_url": "https://clinicaltrials.gov/study/NCT01290484" }, { "nct_id": "NCT00718185", "title": "Pharmacokinetics and Pharmacdynamics of Sildenafil", "overall_status": "TERMINATED", "study_type": "OBSERVATIONAL", "phases": [], "conditions": [ "Pulmonary Hypertension" ], "interventions": [ { "name": "Obtain blood specimens", "type": "PROCEDURE" } ], "intervention_types": [ "PROCEDURE" ], "sponsor": "Children's Hospital of Philadelphia", "sponsor_class": "OTHER", "healthy_volunteers": false, "eligibility": { "minimum_age": "28 Days", "maximum_age": null, "sex": "ALL", "summary": "28 Days and older" }, "enrollment_count": 9, "start_date": "2008-05", "completion_date": "2010-02", "has_results": false, "last_update_posted_date": "2015-03-12", "last_synced_at": "2026-10-14T11:50:26.222Z", "location_count": 1, "location_summary": "Philadelphia, Pennsylvania", "locations": [ { "city": "Philadelphia", "state": "Pennsylvania" } ], "official_url": "https://clinicaltrials.gov/study/NCT00718185" }, { "nct_id": "NCT00544076", "title": "ED Recovery in Men Age