Some platforms have a digital pharmacy that ships the medication to your home, while others send an electronic prescription to your local pharmacy. There are many safe, reliable online services offering ED prescriptions. Follow-up support: Make sure you can get the help you need if questions or concerns arise after ordering. While each PDE5 inhibitor differs slightly, they’re very similar in treating erectile dysfunction. More serious side effects may include a drop in blood pressure or an erection that lasts longer than four hours. It’s best to check your chosen provider’s site for more information. You can see an in-person provider or speak with a doctor virtually.Here’s our process. How we vet brands and products Erectile dysfunction medications, including Viagra and Cialis, help the muscles in the penis relax so you can get and maintain an erection. Here’s our process. How we vet brands and products Erectile dysfunction medications, including Viagra and Cialis, help the muscles in the penis relax so you can get and maintain an erection. Levitra (vardenafil): This medication is taken one hour before sex and can last up to 24 hours. It’s available in 10 mg and 20 mg tablets. Stendra (avanafil): This is an as-needed medication taken 30 minutes before sex and can last up to six hours. It’s available in 50 mg, mg, and mg tablets.