It’s available in 10 mg and 20 mg tablets. The specific process for getting ED pills online depends on your chosen provider. Here are some key factors to consider when deciding: Pricing: Know how much your monthly supply will cost with shipping and tax. Your health information should remain between your provider and yourself. Side effects Side effects of oral ED medicines are often mild.Sildenafil (Viagra). This medicine works best when you take it on an empty stomach an hour before sex. The body takes longer to absorb it after a high-fat meal or alcohol. Its effects often last for 4 to 5 hours. It might work longer if you have mild to moderate erectile dysfunction. Vardenafil. Generic Viagra (sildenafil): $4 per 25 mg pill, $6 per 50 mg pill, $10 per mg pill; Branded. Drug Images What is Viagra? Viagra is a brand-name prescription drug that’s approved to treat erectile dysfunction (ED). With ED, you’re unable to have or maintain an erection. Viagra is.