The generic versions are just as effective and much less expensive. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours. All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. Some platforms have a digital pharmacy that ships the medication to your home, while others send an electronic prescription to your local pharmacy. Erectile dysfunction medications require a prescription from a licensed provider. It’s best to check your chosen provider’s site for more information.Still, if your doctor says it’s okay for you to use and you end up paying out-of-pocket, you can still get the generic for a lot less than Viagra. According to price . Typical dosing for Sildenafil (Viagra) The typical dose is to take 50 mg of sildenafil (Viagra) by mouth, about 1 hour before sex, as needed. The maximum . Best Low Cost: GoodRx. Fastest Delivery: Blink Health.: Sesame. Sign Up Now. Key Specs. Cost: Consultation prices vary based on the prescriber; $5 generic .