Bottom Line Many psychiatrists are uncomfortable prescribing nonpsychotropic medications, but there are numerous clinical scenarios in which the practice would make sense. How oral medicines differ Each oral medicine for ED has a slightly different chemical makeup. Strategies for managing sexual dysfunction induced by antidepressant medication. Ask your pharmacist or doctor for a copy of the manufacturer’s information for the patient. If you are taking sildenafil for erectile dysfunction, your doctor will probably start you on an average dose of sildenafil and increase or decrease your dose depending on your response to the medication. · Sildenafil (Oral Route) Description and Brand Names. Drug information provided by: Merative, Micromedex ®. US Brand Name. Revatio. Viagra. Descriptions. . Ask your doctor. 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 . Oral medicines for ED usually work well and cause few side effects. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil .