Drug Interactions between Meprozine and safinamide

Using safinamide together with meperidine is not recommended. Combining these medications can increase the risk of respiratory depression, low blood pressure, and a rare but serious condition called the serotonin syndrome, which may include symptoms such as confusion, hallucination, seizure, extreme changes in blood pressure, increased heart rate, fever, excessive sweating, shivering or shaking, blurred vision, muscle spasm or stiffness, tremor, incoordination, stomach cramp, nausea, vomiting, and diarrhea. Severe cases may result in coma and even death. In general, you should wait at least 14 days after stopping safinamide before you start treatment with meperidine. Conversely, if you have recently been on meperidine and are now starting treatment with safinamide, you should check with your doctor or pharmacist to see how long you should wait before it is safe for you to use safinamide, as some medications can take a while to clear from your body. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Using meperidine together with promethazine may increase side effects such as drowsiness, dizziness, lightheadedness, confusion, depression, low blood pressure, slow or shallow breathing, and impairment in thinking, judgment, and motor coordination. Occasionally, severe reactions may result in coma and even death. Talk to your doctor if you have any questions or concerns. Your doctor may be able to prescribe alternatives that do not interact, or you may need a dose adjustment or more frequent monitoring by your doctor to safely use both medications. You should avoid the use of alcohol while being treated with these medications. Also avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medications affect you, and use caution when getting up from a sitting or lying position. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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Using promethazine together with safinamide can increase the side effects of both medications. You may be more likely to develop low blood pressure and related problems such as dizziness, lightheadedness, fainting, weakness, and a rapid pulse/heart rate. Nervous system side effects such as drowsiness, confusion, disorientation, memory loss, and seizures may also increase. Let your doctor know if you experience these symptoms and they do not go away after a few days or they become troublesome. These side effects can occur with either medication alone and are most often seen at the beginning of treatment, following a dose increase, or when treatment is restarted after an interruption. Alcohol may also increase these effects, so you should avoid the consumption of alcohol during treatment with these medications. You should seek immediate medical attention if you develop fever, muscle stiffness, confusion, sweating, fast or uneven heartbeats, restless muscle movements in your face or neck, tremor (uncontrolled shaking), or difficulty swallowing. Avoid driving or operating hazardous machinery until you know how the medications affect you, and use caution when getting up from a sitting or lying position. You may need a dose adjustment or more frequent monitoring by your doctor to safely use both medications. It is important to tell your doctor about all other medications you use, including vitamins and herbs. Do not stop using any medications without first talking to your doctor.

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