Drug Interactions between biperiden and dihydrocodeine / guaifenesin

Using biperiden together with dihydrocodeine can increase nervous system side effects such as dizziness, drowsiness, and difficulty concentrating. Some people may also experience impairment in thinking and judgment. You should avoid or limit the use of alcohol while being treated with these medications. Do not use more than the dosages prescribed by your doctor, and avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medication affects you. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medication without first talking to your doctor.