In some cases, online ED providers accept health insurance. According to the FDA, generic medications contain the same active ingredients as brand names, meaning there’s no difference in effectiveness or safety. The mechanism of action for ED pills is simple: They inhibit the PDE5 enzyme which regulates the signals responsible for the smooth muscle tissue. They have the same benefits and risks as their brand-name counterparts. 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.Injectable ED medications. There are a few FDA-approved injectable medications used to treat ED. As covered earlier, these include Caverject, Caverject Impulse, and Edex. They all contain alprostadil — one of the ingredients in TriMix. They also tend to be expensive, with average retail prices over $ for two doses. Vardenafil and tadalafil (Cialis) are both first-choice medications for treating ED. However, tadalafil (Cialis) can also be used to treat symptoms from an enlarged both medications can be used as needed for sexual activity (up to once a day), it’s possible for some people to take tadalafil (Cialis) daily on a regular basis . Low blood pressure. Muse (alprostadil) might lower your blood pressure, which can cause dizziness, lightheadedness, blurred vision, or fainting. If you feel any of these symptoms, sit down right away so you don’t fall. To avoid this, your provider will prescribe the lowest dose of the medication that works for you.