This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug or commencing any course of treatment.
Severe. These medicines may interact and cause very harmful effects and are usually not taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
When these two medicines are taken together, your body may not process ergotamine derivatives properly.
What might happen:
The blood levels of the ergotamine derivative may increase and cause toxic effects. You may experience nausea, vomiting, decreased mental alertness, seizures, or unconsciousness.
What you should do about this interaction:
Talk to your healthcare professional (e.g. doctor or pharmacist) as soon possible about taking these two medicines together.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
1.Rescriptor (delavirdine mesylate) US prescribing information. Pharmacia & Upjohn Company August, 2012.
2.Methergine (methylergonovine maleate) US prescribing information. Novartis Pharmaceuticals Corporation June, 2012.
3.Sustiva (efavirenz) US prescribing information. Bristol-Myers Squibb Company August, 2012.
4.Atripla (efavirenz/emtricitabine/tenofovir disoproxil fumarate) US prescribing information. Gilead Sciences, Inc. October, 2013.