need to know side effects,how long between taking pills,the bottle says take 1 tablet twice a day ## Morphine seems to have quite a large list of potential side-effects, some of which you can view below: dizziness lightheadedness drowsiness nausea vomiting constipation diarrhea loss of appetite weight loss changes in ability to taste food dry mouth sweating weakness headache agitation nervousness mood changes confusion difficulty falling asleep or staying asleep stiff muscles shaking of a part of your body that you cannot control double vision red eyes small pupils (black circles in the middle of the eyes eye movements that you cannot control chills flu symptoms decreased sexual desire or ability difficulty urinating or pain when urinating slow, shallow, or irregular breathing blue or p...