If it is near the time of the next dose, skip the missed dose and resume your usual dosing schedule. Lipscombe said the new finding adds to concerns about the drugs, some of which already carry safety warnings after they were found to increase the risk of stroke and death in older people. Higher maintenance doses of quetiapine may be required when it is coadministered with phenytoin and other enzyme inducers such as carbamazepine and phenobarbital See Drug Interactions under PRECAUTIONS. quetiapine fara prescriptie transportate Metabolism and Elimination: Following single oral dose of 14C-quetiapine, less than of the administered dose was excreted as unchanged drug, indicating that quetiapine is highly metabolized. Patients with an established diagnosis of diabetes mellitus who are started on atypical antipsychotics should be monitored regularly for worsening of glucose control. Com provides free, accurate and independent advice on more than 24,000 prescription drugs, over-the-counter medicines natural products.