It’s best to check your chosen provider’s site for more information. It’s available in 50 mg, mg, and mg tablets. You should also call your insurance company to see if they cover erectile dysfunction medications. Your primary care doctor should always know what medications you’re taking, including ED pills prescribed by another provider. Most online pharmacies do not prescribe or refill controlled substances, like Adderall, Xanax, or oxycodone. Stendra avanafil : This is an as-needed medication taken 30 minutes before sex and can last up to six hours.Brand Cialis Generic Tadalafil No data Form Bottle Box Disp Pack Tablet No data Dosage mg 5mg 10mg 20mg No data Quantity 5 6 10 15 30 90 No data. Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include headache and indigestion. Tadalafil (Cialis) does interact with . Cialis (tadalafil) is a prescription medication for those with erectile dysfunction. Many providers sell Cialis online — learn about the safest and most discreet providers here.