Do you drink alcohol? If you are taking sildenafil for PAH, take the missed dose as soon as you remember it. What should I do if I forget a dose? Recent heart or blood vessel problems. Take sildenafil exactly as directed.Viagra basics The active drug in Viagra is sildenafil. It belongs to a group of drugs called phosphodiesterase-5 inhibitors. Viagra comes as tablets you take by mouth. . Do not take any more doses of sildenafil or similar medications such as tadalafil (Cialis) or vardenafil (Levitra) until you talk to your doctor. There have been reports of heart attack, . Sildenafil (Viagra) Tadalafil (Adcirca, Cialis) Vardenafil (Levitra, Staxyn) Avanafil (Stendra) All four medications enhance the effects of nitric oxide — a natural .

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