Your doctor or other health care professional can recommend one for you based on these factors, other health conditions you have and any other medicines you take. Understanding Erectile Dysfunction and Its Treatment Cialis, scientifically known as Tadalafil, is a prescription medication primarily used to treat erectile dysfunction ED in men. These small differences affect the way each medication works, such as how quickly it takes effect and wears off, and the possible side effects. Side effects Side effects of oral ED medicines are often mild. People with kidney or liver problems will need to either take a lower dose of Cialis or avoid the medication altogether, depending on the severity of the condition. Cialis Daily tadalafil : This low-dose Cialis works by increasing blood flow to the penis over time, making it easier to have an erection when aroused. Make sure to get an estimate of when you can expect your prescription in the mail.Our medical team can give you a prescription for sildenafil 20mg. The Lemonaid Pharmacy can deliver it to you for $2/pill, including FREE delivery. Our medical team can prescribe it in a 20mg, 60mg or mg dose. To choose the best ED medicine for you, check out: Of All the Erectile Dysfunction Drugs, Which One’s the Best? Get started. 1. Check your insurance coverage Since Cialis is available as a generic, many insurance plans now cover it (to varying degrees). Generally, Medicare does not cover Cialis, since it’s not considered medically necessary. Tadalafil (Cialis). This medication is taken with or without food an hour before sex. It works for up to 36 hours. You can take it in a small dose daily or in a larger dose as needed. If you do buy medicines over the internet: Check to see if an online pharmacy is legitimate. Never order medicines from an online pharmacy that doesn’t list.