Before taking dextromethorphan, tell your doctor if you are using any of the following drugs:
celecoxib (Celebrex);
cinacalcet (Sensipar);
darifenacin (Enablex);
imatinib (Gleevec);
quinidine (Quinaglute, Quinidex);
ranolazine (Ranexa)
ritonavir (Norvir);
sibutramine (Meridia);
terbinafine (Lamisil);
medicines to treat high blood pressure; or
antidepressant medications such as amitriptyline (Elavil, Etrafon), bupropion (Wellbutrin, Zyban), fluoxetine (Prozac, Sarafem), fluvoxamine (Luvox), imipramine (Janimine, Tofranil), paroxetine (Paxil), sertraline (Zoloft), and others.
This list is not complete and there are numerous other drugs that can interact with dextromethorphan. Tell your doctor about all the prescription and over-the-counter medications you use. This includes vitamins, minerals, herbal products, and drugs prescribed by other doctors. Do not start using a new medication without telling your doctor.
 Dextromethorphan drug interactions (more detail)
