What side effects are possible with this medication?
A side effect is an unwanted response to a medication when it is taken in normal doses. It can be mild or severe, temporary or permanent, but does not occur in everyone. The following side effects have been reported by at least 1% of people taking this medication. If you develop any of these side effects (or any other side effects not listed here) or they change in intensity, speak to your doctor or pharmacist for advice on managing them and on the risks and benefits of the medication.
- blurred vision
- difficulty urinating
- disturbed behavior or agitation
- dizziness or lightheadedness when rising from a lying or sitting position
- dry mouth
- false sense of well-being (especially for seniors or those taking high doses)
- nausea or vomiting
to learn about serious side effects that can potentially occur with any medication. These examples are provided for information purposes only and are not meant to be exhaustive. Always consult your doctor for sound medical advice specific to your particular medication and treatment.
If you experience a serious side effect, you or your doctor may send a report to the Food and Drug Administration’s (FDA) MedWatch Adverse Event Reporting program online or by phone at 1-800-332-1088.
Are there any other precautions or warnings for this medication?
Before you begin taking a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use this medication.
Drowsiness/reduced alertness: Occasional drowsiness may occur after taking biperiden. you should not drive or perform hazardous tasks until you determine that this medication does not impair your ability to perform these tasks safely.
Mental effects: Biperiden can sometimes cause confusion, mood-lifting effects, agitation, or disturbed behavior in susceptible people. Report these effects to your doctor immediately.
Other medical conditions: You should be closely monitored by your doctor while taking this medication if you have:
- a seizure disorder
- an enlarged prostate
- irregular heart rhythms (arrhythmia)
- prostate cancer
Withdrawal: Except in the case of a medical emergency, biperiden should not be stopped suddenly, as this may cause rebound Parkinson symptoms (shakiness or restlessness).
Pregnancy: The safe use of biperiden during pregnancy has not been established. This medication should not be used during pregnancy unless the benefits outweigh the risks. If you become pregnant while taking this medication, contact your doctor immediately.
Breast-feeding: It is not known whether biperiden passes into breast milk. If you are a breast-feeding mother and are taking this medication, it may affect your baby. Talk to your doctor about whether you should continue breast-feeding.
Children: The safety and effectiveness of this medication have not been established for children.
Seniors: Seniors may be more sensitive to the effects of biperiden.
What other drugs could interact with this medication?
There may be an interaction between biperiden and any of the following:
- antihistamines (e.g., chlorpheniramine)
- phenothiazines (e.g., chlorpromazine)
- tricyclic antidepressants (e.g., amitriptyline)
If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:
- stop taking one of the medications,
- change one of the medications to another,
- change how you are taking one or both of the medications, or
- leave everything as is.
An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.
Medications other than those listed above may interact with this medication. Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.