Drug Interactions between methamphetamine and rolapitant

Rolapitant may increase the blood levels of methamphetamine. This may increase the risk and/or severity of side effects such as nervousness, increased heart rate and/or blood pressure, loss of appetite, and circulation problems in your fingers and toes. Combining these medications can also increase the risk of seizures, especially if both medications are associated with an increased seizure risk. The risk of getting a rare but serious condition called serotonin syndrome, which has been seen with methamphetamine, might also be increased. Symptoms of serotonin syndrome include 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 cramps, nausea, vomiting, and diarrhea. Severe cases may result in coma and even death. You should contact your doctor immediately if you experience these symptoms while taking the 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.