You can see an in-person provider or speak with a doctor virtually. Erectile dysfunction medications require a prescription from a licensed provider. Other conditions that may disqualify you from an ED prescription include a history of stroke, kidney or liver disease, cancer, diabetes, or a bleeding disorder. Our erectile dysfunction Rx options We offer prescription medications clinically proven to help improve erections. The FDA has also approved tadalafil for treatment of both benign prostatic hypertrophy and erectile dysfunction where the two conditions co-exist. An erection is the result of an increase in blood flow into certain internal areas of the penis.Best subscription with free consultations. Daily tadalafil: or 5 mg daily pill. Tadalafil: 5 mg, 10 mg, or 20 mg, taken as needed. Cialis: mg, 5 mg, 10 mg, and 20 mg, taken as needed. headache. indigestion. back pain. muscle pain. flushing. stuffy nose. Patients who get back pain and muscle aches usually get them 12 to 24 hours after taking Cialis and these usually go away by.  · The approved dosages of Cialis for ED, BPH symptoms, or both, are between mg and 20 mg a day or as needed. Dosages higher than 20 mg a day haven’t been studied, and it’s not known what.