People who have trouble getting or keeping an erection often take Cenforce 100, which contains sildenafil citrate. Cenforce 100 can have side effects, just like any other drug. Headaches, dizziness, flushing, indigestion, stuffy noses, and changes in vision like blurred vision or greater sensitivity to light are all common side effects of Cenforce 100. More dangerous side effects, like priapism (a painful, long-lasting erection), sudden hearing loss, or allergic reactions, may happen very rarely. Speaking to a doctor before taking Cenforce 100 is important to learn about the pros and cons and to talk about any possible side effects or medicines that might not work well with it.