This chart compares 6 major erectile dysfunction drugs currently on the market: Viagra, Levitra, Cialis, Staxyn, Stendra, Caverject injections, and the MUSE suppository.  Visit our Decision Guide to ED Drugs   Name of Drug When to Take Dose Dietary Restrictions Viagra (sildenafil) Take between 30 and 60 minutes (and up to 4 hours) before sex; works for up to 4 hours. Recommended dose for most men is 50 mg; after that, dosage may go to as high as 100 mg, … Continue reading Erectile Dysfunction Drugs Comparison Chart