Follow your doctor’s directions carefully, and ask your doctor or pharmacist to explain any part you do not understand. Take tadalafil exactly as directed. One advantage Cialis has over Viagra and Levitra is its What should I do if I forget a dose? There are many other treatments for erectile dysfunction. Read more on male sexual health on the Sexual Health Australia site.Roman is a telehealth prescription service and online pharmacy that provides prescription Cialis for ED and a host Brand-name and generic Cialis: The price for brand-name Cialis can be pretty. Cialis lasts up to 36 hours in the body, while Viagra lasts 4–6 hours in the body. Both are taken 30 minutes before sex. Cialis can cause limb pain, while Viagra can cause vision change, rash. AdComplete the Online Consultation with our Doctor. Personalize Your Needs. If Appropriate, Get a Prescription for ED from RexMD®. Free Shipping AvailableFree Shipping · Real Doctors · Discreet Packaging · Personalized Plan.