Here are some steps you can take: Don’t assume you have a long-term problem. Recent heart or blood vessel problems. It’s available in 25 mg, 50 mg, and mg tablets and lasts up to 18 hours. More Information Erectile dysfunction dietary supplements Coping and support Whether the cause is physical, psychological or a combination of both, erectile dysfunction can become a source of mental and emotional stress for you and your partner. Levitra vardenafil : This medication is taken one hour before sex and can last up to 24 hours.Oral medicines for ED usually work well and cause few side effects. The four main medicines taken by mouth for erectile dysfunction are: Avanafil (Stendra). Sildenafil . If you’re interested in buying Viagra online, five of the best options available are Hims, Roman, Lemonaid, Optum Store, and REX MD. Read on for full details on the process . Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision .