It is very important that your doctor check your progress closely while you are receiving this medicine to see if it is working properly and to allow for a change in the dose.
This medicine will add to the effects of alcohol and other CNS depressants (medicines that make you drowsy or less alert). Some examples of CNS depressants are antihistamines or medicine for hay fever, other allergies, or colds; sedatives, tranquilizers, or sleeping medicine; prescription pain medicine or narcotics; barbiturates or medicine for seizures; muscle relaxants; or other anesthetics, including some dental anesthetics. Check with your medical doctor or dentist before taking any of the above while you are receiving this medicine.
Check with your doctor right away if you have bluish lips or skin; chest pain; difficulty with breathing; a fast, pounding, or irregular heartbeat or pulse; shortness of breath; or muscle stiffness after receiving this medicine.
Dizziness, lightheadedness, or fainting may occur with this medicine, especially when you get up from a lying or sitting position suddenly. Getting up slowly may help, but if the problem continues or gets worse, check with your doctor.
This medicine may cause constipation. This is more common if you use it for a long time. Ask your doctor if you should also use a laxative to prevent and treat constipation.