How do you choose which one is better for you? The other part of your decision of Cialis vs Viagra will be your lifestyle. A high-fat meal taking Viagra will slow down its effects. Do not chew on it or break it apart. The main difference between the side effects of Cialis and Viagra is the rate at which these occur. Key Takeaways… So, Cialis vs Viagra — who won?Has a generic version of Cialis been approved? Yes. The following products are equivalent to Cialis: tadalafil tablet;oral Manufacturer: ACCORD HLTHCARE . Tadalafil is in a class of drugs called phosphodiesterase-5 (PDE5) inhibitors and is available in a generic form often called generic Cialis. Tadalafil has been on the .