Moderate. These medicines may cause some risk when taken together. Contact your healthcare professional (e.g. doctor or pharmacist) for more information.
How the interaction occurs:
The cause of the interaction is not known. Cimetidine may increase the effects of quinidine.
What might happen:
Your blood levels of quinidine may increase and cause toxic effects.
What you should do about this interaction:
If you experience nausea, vomiting, diarrhea, headache, ringing in the ears, dizziness, or confusion contact your healthcare professionals (e.g. doctor or pharmacist). They 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.
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