A health care professional will prescribe a prefilled applicator for you to insert the pellet about an inch into your urethra. Are there any problems in your relationship with your sexual partner? Slowly pull back the plunger until the required dose. Common ones include: Flushing of the skin. Generic versions of sildenafil, vardenafil and tadalafil are available. If you have chronic health conditions or your doctor suspects an underlying condition might be involved, you could need further tests or a consultation with a specialist such as me.Q&A Drug Images What is Viagra? If you have erectile dysfunction (ED), your doctor may recommend that you take Viagra. It’s a prescription drug that’s used in adult males* with . For treatment of erectile dysfunction: For oral dosage form (tablets): Adults up to 65 years of age—50 milligrams (mg) as a single dose no more than once a day, 1 hour before . Cialis, Levitra, Staxyn, and Viagra to Treat ED. Alprostadil for ED. New ED Treatments. Testosterone Replacement Therapy for ED. Alternative Remedies for ED. Yohimbe Bark .