These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. Payment options: Consider how you’d like to pay. Erectile dysfunction medications require a prescription from a licensed provider. If approved, the provider will issue a prescription. Read more in our editorial policy.$$70 per dose: $90 per dose: Viagra doses: 25 mg, 50 mg, or mg: 25 mg, 50 mg, or mg: 25 mg, 50 mg, or mg: Sildenafil price without insurance* Starting at $6 . Generic Viagra (sildenafil): $4 per 25 mg pill, $6 per 50 mg pill, $10 per mg pill; Branded Viagra: $90 per 25 mg, 50 mg, or mg pill; Generic Cialis (tadalafil): $11 . Generic Viagra (sildenafil) is an alternative to the branded Viagra drug that can be used for treating erectile dysfunction (ED). It’s now sold by many manufacturers, including online.