Who should avoid taking Viagra? Do not use Viagra if you have a known allergy to any of the ingredients., Talk to your doctor before using Viagra to make sure your heart is healthy enough to use Viagra. What are the risks? Viagra can be dangerous for patients with cardiovascular conditions. Discuss your risk with your doctor if you have any of the following: High or low blood pressure History of heart attack, stroke, or life-threatening arrhythmia within the last six months Pulmonary hypertension secondary to sickle cell anemia Pulmonary veno-occlusive disease, High or low blood pressure, History of heart attack, stroke, or life-threatening arrhythmia within the last six months, Pulmonary hypertension secondary to sickle cell anemia, Pulmonary veno-occlusive disease, Talk to your doctor if you have liver or kidney problems. They could adjust your dose as appropriate., Viagra can cause a sudden loss of vision or hearing., Viagra can cause persistent and painful erections. You could be at an increased risk if you have any of the following: Anatomical deformation of the penis (angulation, curvature, cavernosal fibrosis, or Peyronie disease) Sickle cell anemia Multiple myeloma Leukemia, Anatomical deformation of the penis (angulation, curvature, cavernosal fibrosis, or Peyronie disease), Sickle cell anemia, Multiple myeloma, Leukemia, If you experience an erection that lasts more than four hours, contact your doctor immediately. High or low blood pressure, History of heart attack, stroke, or life-threatening arrhythmia within the last six months, Pulmonary hypertension secondary to sickle cell anemia, Pulmonary veno-occlusive disease Anatomical deformation of the penis (angulation, curvature, cavernosal fibrosis, or Peyronie disease), Sickle cell anemia, Multiple myeloma, Leukemia Viagra is contraindicated if you use any of the following medications Organic nitrates, Ritonavir, Saquinavir, Indinavir, Nitroprusside, Boceprevir, Fosamprenavir, Telaprevir, Amprenavir, Phosphodiesterase inhibitors, Atazanavir, Amyl nitrate, Nelfinavir, Cobicistat, Lopinavir, Darunavir, Tipranavir, Molsidomin Talk to your doctor before taking Viagra if you use any of the following medications. Telithromycin, Dihydrocodeine, Nefazodone, Voriconazole, Itraconazole, Conivaptan, Cannabis, Duvelisib, Lorlatinib, Larotrectinib, Fluconazole, Simeprevir, Netupitant, Ceritinib, Clarithromycin, Lumacaftor, Ivosidenib, Idelalisib, Silodosin, Bosentan, Etravirine, Nebivolol, Ketoconazole, Ciprofloxacin, Alpha-1 adrenergic blockers, Rifapentine, Erythromycin, Delavirdine, Crizotinib, Ranolazine, Apalutamide, Paclitaxel, Furosemide, Cimetidine
