Sodium oxybate (ghb) because an increase in sleep duration and a decrease in the ability to breathe are likely to occur. Mao inhibitors (eg, phenelzine) because serious side effects, such as high blood pressure or seizure, may occur. Antibiotics that may cause hearing problems (eg, gentamicin, vancomycin) because dramamine may mask symptoms of hearing problems. This may not be a complete list of all gabapentin 300 mg side effects interactions that may occur. Ask your health care provider if dramamine may interact with other medicines that you take. Check with your health care provider before you start, stop, or change the dose of any medicine. You are allergic to any ingredient in dramamine or other similar medicines. You are currently taking or have taken a monoamine oxidase (mao) inhibitor (eg, phenelzine) in the past 14 days. Contact your doctor or health care provider right away if any of these apply to you. Dramamine may cause drowsiness or dizziness. Do not drive, operate machinery, or do anything else that could be dangerous until you know how you react to dramamine.