It may be difficult to remain firm despite wanting to have sex. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours. Some services offer a subscription option where they’ll send your medications every month at a discount. Insurance can help you save even more on consultations and medications.Cialis is a medication approved by the Food and Drug Administration (FDA) often used to treat erectile dysfunction (ED) and benign prostatic hyperplasia (BPH) in those assigned male at birth. Drug details Here are some details about Cialis: Drug form: oral tablet Generic version: tadalafil Read on to learn about Cialis and cost, as well as how to save money on prescriptions and find. Generic Cialis, or Tadalafil, is available in several doses in tablet form: milligrams (mg), 5 mg, 10 mg, and 20 mg. Depending on the dose for ED, you can use it as needed before sexual.