Methylphenidate Side Effects
What should I watch for?
Visit your doctor or health care professional for regular checks on your progress. This prescription requires that you follow special procedures with your doctor and pharmacy. You will need to have a new written prescription from your doctor or health care professional every time you need a refill.
This medicine may affect your concentration, or hide signs of tiredness. Until you know how this drug affects you, do not drive, ride a bicycle, use machinery, or do anything that needs mental alertness.
Tell your doctor or health care professional if this medicine loses its effects, or if you feel you need to take more than the prescribed amount. Do not change the dosage without talking to your doctor or health care professional.
For males, contact your doctor or health care professional right away if you have an erection that lasts longer than 4 hours or if it becomes painful. This may be a sign of a serious problem and must be treated right away to prevent permanent damage.
Decreased appetite is a common side effect when starting this medicine. Eating small, frequent meals or snacks can help. Talk to your doctor if you continue to have poor eating habits. Height and weight growth of a child taking this medicine will be monitored closely.
Do not take this medicine close to bedtime. It may prevent you from sleeping.
If you are going to need surgery, a MRI, CT scan, or other procedure, tell your doctor that you are taking this medicine. You may need to stop taking this medicine before the procedure.
Tell your doctor or healthcare professional right away if you notice unexplained wounds on your fingers and toes while taking this medicine. You should also tell your healthcare provider if you experience numbness or pain, changes in the skin color, or sensitivity to temperature in your fingers or toes.
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:
Black, tarry stools
blood in the urine or stools
blurred vision or other changes in vision
crusting, dryness, or flaking of the skin
pinpoint red spots on the skin
scaling, severe redness, soreness, or swelling of the skin
uncontrolled vocal outbursts or tics (uncontrolled and repeated body movements)
unusual bleeding or bruising
Incidence not known
feeling like surroundings are not real
numbness of the hands
painful or difficult urination
paleness or cold feeling in the fingertips and toes
red, irritated eyes
red, swollen, or scaly skin
seeing, hearing, or feeling things that are not there
severe or sudden headache
sores, ulcers, or white spots on the lips or in the mouth
sudden loss of coordination
sudden slurring of speech
unusual tiredness or weakness
yellow skin or eyes
Get emergency help immediately if any of the following symptoms of overdose occur:
Symptoms of overdose
bigger, dilated, or enlarged pupils of the eyes
confusion as to time, place, or person
dizziness, faintness, or lightheadedness when getting up suddenly from a lying or sitting position
dry eyes, mouth, nose, or throat
false or unusual sense of well-being
fast, slow, irregular, pounding, or racing heartbeat or pulse
holding false beliefs that cannot be changed by fact
increased sensitivity of the eyes to light
loss of consciousness
muscle pain or stiffness
pounding in the ears
rapid, shallow breathing
unusual excitement, nervousness, or restlessness
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:
loss of appetite
unusually warm skin
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.