What should I watch for?
Visit your doctor or health care professional for regular checks on your progress. It may be several weeks before you see the full effects. Do not suddenly stop taking this medicine. You may need to gradually reduce the dose. Only stop taking this medicine on the advice of your doctor or health care professional.
You may get dizzy or drowsy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol can increase dizziness and drowsiness. Avoid alcoholic drinks. You can get a hangover effect the morning after a bedtime dose.
This medicine can reduce the response of your body to heat or cold. Dress warm in cold weather and stay hydrated in hot weather. If possible, avoid extreme temperatures like saunas, hot tubs, very hot or cold showers, or activities that can cause dehydration such as vigorous exercise.
Common and Rare Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
changes in vision, including blurred vision
difficulty speaking or swallowing
inability to move the eyes
increase in amount of urine
loss of balance control
muscle spasms of the face, neck, and back
problems with urination
restlessness or need to keep moving (severe)
skin rash or itching
stiffness or weakness of the arms or legs
tic-like or twitching movements
trembling and shaking of the fingers and hands
twisting body movements
speech or vision problems
sudden weakness or numbness in the face, arms, or legs
fast, shallow breathing
fast, weak heartbeat
lip smacking or puckering
loss of appetite
pale, clammy skin
prolonged, painful, inappropriate erection of the penis
puffing of the cheeks
rapid or worm-like movements of the tongue
talking, feeling, and acting with excitement and activity that cannot be controlled
uncontrolled chewing movements
uncontrolled twisting movements of neck, trunk, arms, or legs
unusual bleeding or bruising
unusual facial expressions or body positions
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
increased dream activity
increased length of sleep
sleepiness or unusual drowsiness
stuffy or runny nose
unusual tiredness or weakness
Absent, missed, or irregular menstrual periods
body aches or pain
breast swelling or soreness
darkening of skin color
decreased interest in sexual intercourse
inability to have or keep an erection
increase in body movements
increased watering of the mouth
loss in sexual ability, desire, drive, or performance
loss of voice
pain or tenderness around the eyes and cheekbones
shortness of breath or troubled breathing
stopping of menstrual bleeding
tightness in the chest
unusual breast milk production
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.