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The effects of Cialis last for 24 to 36 hours and due to this side effects such as back pain and severe muscle ache may be visible in patients.
It may also cause rare vision change such as seeing blue tinge to objects or having difficulty in making difference between green and blue color.
Cialis may cause priapism i.e. the erection lasts more than 4 hours. In this case, the patient should seek immediate help of a doctor.
It is rarely seen in patients with ED and in men taking PDE5 inhibitors (oral ED medicine), that vision decreases or loss of vision occurs in one eye or both of their eyes. This might be possible due to combination of some other drugs like diabetes or blood pressure. But if it happens, you must stop all the PDE5 inhibitors including Cialis and must contact doctor immediately.
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