Medicines that you take by mouth are called oral medicines. Depending on your particular health concerns, you might go directly to a specialist — such as a doctor who specializes in male genital problems urologist or a doctor who specializes in the hormonal systems endocrinologist. Is my erectile dysfunction most likely temporary or chronic? Write down questions to ask your doctor. They enhance the effects of a chemical the body makes that relaxes muscles in the penis, called nitric oxide. Involve your sexual partner. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects.Optum Store offers several ED medications with free and discreet shipping. The company sells generic tadalafil in 5, 10, and 20 mg doses. People can choose from a 30, 90, or day supply, with. Oral erectile dysfunction medications are not aphrodisiacs, will not cause excitement and are not needed in people who get normal erections. The medications vary in dosage, how long they work and side effects. Possible side effects include flushing, nasal congestion, headache, visual changes, backache and stomach upset. Their efficacy may not have been scientifically tested to the same degree as the drugs listed in the table above. However there may be historical, cultural or anecdotal evidence linking their use to the treatment of Erectile Dysfunction. Damiana. Horny Goat Weed.