The most common side effects with Cialis are:
* headache
* indigestion
* back pain
* muscle aches
* flushing
* stuffy or runny nose
These side effects usually go away after a few hours. Patients who get back pain and muscle aches usually get it 12 to 24 hours after taking Cialis. Back pain and muscle aches usually go away by themselves within 48 hours.
Cialis may uncommonly cause:
* an erection that won’t go away (priapism)
* vision changes, such as seeing a blue tinge to objects or having difficulty telling the difference between the colors blue and green