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:
Less common- Shakiness and unsteady walk
- Unsteadiness, trembling, or other problems with muscle control or coordination
- Being forgetful
- Burning, crawling, itching, numbness, prickling, "pins and needles", or tingling feelings
- Continuing ringing or buzzing or other unexplained noise in the ears
- Discouragement
- False or unusual sense of well-being
- Fast, pounding, or irregular heartbeat or pulse
- Feeling sad or empty
- Hearing loss
- Irritability
- Lack of appetite
- Loss of interest or pleasure
- Nightmares
- Sleeplessness
- Tiredness
- Trouble concentrating
- Trouble sleeping
- Unable to sleep
- Abdominal or stomach pain
- Actions that are out of control
- Aggressiveness
- Anxiety
- Changes in patterns and rhythms of speech
- Chest pain
- Chills
- Clay-colored stools
- Confusion about identity, place, and time
- Dark urine
- Decrease in frequency of urination
- Decrease in urine volume
- Difficulty in passing urine (dribbling)
- Dizziness
- Drowsiness
- Dry mouth
- Environment seems unreal
- Fainting
- Falling
- False beliefs that cannot be changed by facts
- Feeling of unreality
- Fever
- Headache
- Hyperventilation
- Inability to move eyes
- Increased blinking or spasms of the eyelid
- Increased muscle spasm
- Irregular heartbeats
- Loss of appetite
- Loss of bladder control
- Loss of memory
- Nausea
- Nervousness
- Nightmares
- Painful urination
- Problems with memory
- Rash
- Relaxed and calm
- Restlessness
- Seeing, hearing, or feeling things that are not there
- Sense of detachment from self or body
- Shortness of breath
- Sleep walking
- Sleepiness
- Slurred speech
- Sticking out of tongue
- Talking, feeling, and acting with excitement
- Trouble in breathing, speaking, or swallowing
- Uncontrolled twisting movements of the neck, trunk, arms, or legs
- Unpleasant breath odor
- Unusual excitement, nervousness, restlessness, or irritability
- Unusual facial expressions
- Unusual tiredness or weakness
- Vomiting of blood
- Yellow eyes or skin
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:
More common- Lightheadedness
- Any change in vision
- Blistering, crusting, irritation, itching, or reddening of skin
- Change in taste or bad, unusual, or unpleasant (after) taste
- Cracked, dry, or scaly skin
- Cramps
- Diarrhea
- Difficulty having a bowel movement (stool)
- Dry mouth
- Swelling
- Weakness
- Decreased interest in sexual intercourse
- Inability to have or keep an erection
- Increase in sexual ability, desire, drive, or performance
- Increase interest in sexual intercourse
- Itching skin
- Loss in sexual ability, desire, drive, or performance
- Menstrual changes
- Redness, swelling, or soreness of the tongue
- Swelling or inflammation of the mouth
- Weight loss
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.


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