Most patients do not suffer serious side effects when they take cancer pain medicines as prescribed by the doctor.

Some pain medicines can cause cancer patients to feel sleepy when you first take them. Such side effects usually goes away within a few days.

Sometimes you become drowsy because, with the relief of the pain, you are now able to catch up on the much needed sleep you missed when you were in pain.

On occasion, people get dizzy or feel confused when they take pain medicines. Tell your doctor or nurse if this happens to you.

Changing your dose or type of medicine can usually solve the problem.

Courtesy of http://www.mesorfa.org/pain/index.php?PHPSESSID=622fc7769b8039fd5a0be7ed88491412#importantFacts

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