† An allergic reaction is possible after taking Cialis. However, this side effect wasn’t reported in clinical studies. To learn more about allergic reaction, see below. Most times, mild side effects of a drug go away within a few days or a couple of weeks.Cialis Tadalafil Cialis 100 mg Jel Cialis 100 mg Jel en âlâ özellikleri ve sa?l?kl? kul