Contact your medical provider if you experience any side effects during treatment. You’ll want to avoid the hundreds maybe thousands of rogue sites that claim to be online pharmacies, but really just want your money. Vardenafil usually works for 4 to 5 hours. It’s available in 50 mg, mg, and mg tablets. It may be difficult to remain firm despite wanting to have sex. Insurance: If you plan to use insurance, make sure the online provider accepts it.Do you need a prescription for Viagra alternatives? Yes, if you are considering erectile dysfunction medications similar to Viagra — like Cialis, generic Viagra, and generic . Best Chewable Pill: BlueChew Best Long-Term Care: K Health Best Low Cost: GoodRx Fastest Delivery: Blink Health: Sesame Sign Up Now Key Specs Cost: Consultation . No, you should not take Viagra if you don’t have ED. Viagra is a prescription medication that can have serious side effects. And it’s approved only to treat ED, not to be used.