As we mentioned, most of the time, side effects from ED medications get better over time. Read more: Levitra — The other ED drug Although Viagra and Cialis are both practical, Cialis may be preferred for its once-daily dosage, as it gives you more freedom to be spontaneous in your sex life. Viagra: Viagra is typically taken as needed, usually 30 minutes to 1 hour before sexual activity. The reality is that although erections are complex biologically, the basics of how to get one — as well as how medications like Viagra and Cialis can make it easier — are pretty simple. However, if you’d feel more comfortable talking with a healthcare provider virtually rather than in person, you can consider requesting an online ED prescription instead. However, consuming excessive amounts of alcohol while taking Cialis may increase the risk of certain side effects. That means you can have erections whenever you want or need them. · You can find the most common side effects of Viagra and Cialis below, along with information on the percentage of men who report these side effects at the minimum . vardenafil (Levitra, Staxyn) Caution: Do not use these ED medications if you take nitrates, such as nitroglycerin or a similar medicine, for chest pain. The combination can cause . Cialis and Viagra have both been shown to be safe and effective for erectile dysfunction. The main differences are cost and timing. For occasional use, most people start with Viagra which also tends to be cheaper. Cialis lasts longer and can also be taken daily at a low dose for regular use. See more.