If you experience any unusual or strange side effects of Cialis, stop using it and call your doctor immediately. Uncommon side effects are rare reported adverse reactions which patients have after Cialis has been administered.
Uncommon side effects are:
Color vision changes are very rare and may include difficulty in telling the difference between blue and green colors, seeing blue shade to objects and other color vision altering.
Priapism is a prolonged and painful erection, which happen in very small number of people, but is a very dangerous condition. If this serious condition is not treated properly and in time, it can lead to complete penis damage. So this condition should be treated as soon as possible. If you experience unusual prolonged erection, do not wait, call your doctor.
In rare cases, men taking PDE5 inhibitors, including tadalafil, reported a sudden loss of vision in one or both eyes. If you have such a condition, get emergency medical help right away. Still it is not proved if Cialis taking is associated with this vision loss.
A very small group of people taking Cialis reported unusual side effects which can be characterized like decrease of hearing. Some of them experienced ringing in the ears and dizziness. This side effect is also can be directly related to the usage of Cialis. If you have sudden decrease of hearing or hearing loss, call your doctor right away.