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 as soon as possible if any of the following side effects occur:
Rare
more common with high doses
Convulsions (seizures)
hallucinations (seeing, hearing, or feeling things that are not there)
irregular or slow heartbeat
shortness of breath or troubled breathing
Symptoms of overdose
Convulsions (seizures)
fast breathing
hallucinations (seeing, hearing, or feeling things that are not there)
increase in blood pressure
irregular heartbeat (continuing)
shortness of breath or troubled breathing (severe or continuing)
slow or fast heartbeat (severe or continuing)
unusual nervousness, restlessness, or excitement
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
Nervousness
restlessness
trouble in sleeping
Less common
Difficult or painful urination
dizziness or light-headedness
fast or pounding heartbeat
headache
increased sweating
nausea or vomiting
trembling
unusual paleness
weakness
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.
 Pseudoephedrine side effects (more detail)
