All PDE5 inhibitors, including Viagra and Cialis, require a valid prescription regardless of the pharmacy or provider. We also looked at additional services, such as access to digital pharmacies and home delivery options. Medical consultations were also taken into consideration, as PDE5 inhibitors require a valid prescription from a licensed medical provider. This information is reviewed by a licensed practitioner who will assess your eligibility for the medication. Insurance can help you save even more on consultations and medications. That’s not to say there aren’t just as many illegitimate sites. Most companies have an FAQ or shipping policy page you can reference to learn whether discreet packaging is available.Tadalafil is in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors and is available in a generic form often called generic Cialis. Tadalafil has been on the . Tadalafil (Cialis) is available both as brand-name and generic tablets. Common side effects of this medication include headache and indigestion. Tadalafil . Cialis Now Available as Generic Tadalafil: Here’s What You Need to Know – GoodRx We have good news for you: generic Cialis, used to treat erectile dysfunction .