The mechanism of action for ED pills is simple: They inhibit the PDE5 enzyme which regulates the signals responsible for the smooth muscle tissue. Generic vs. These PDE5 inhibitors may cause headache, flushing, drop in blood pressure, or other adverse effects. They have the same benefits and risks as their brand-name counterparts. Contact your medical provider if you experience any side effects during treatment.Delivery time: 2–5 business days. Prescription needed: yes. Dosage: 5 mg. Usage: take as needed or daily at a low dosage. GET STARTED WITH HIMS. MNT ‘s review. At Hims, Cialis is available. Cialis is approved by the FDA to treat erectile dysfunction (ED). Our medical team can prescribe Cialis 5mg, 10mg, and 20mg. The starting dose we generally recommend is 10mg. Tadalafil is the name for the active chemical ingredient in Cialis. You need a prescription to get Cialis, which you can acquire through your doctor or telehealth sources. Online ordering can be a great alternative if you prefer the convenience and discretion.