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What should I know about dextromethorphan and promethazine before using it?

There are certain precautions you should be aware of before taking dextromethorphan and promethazine. It may cause harmful reactions if you have a history of certain medical conditions, including high blood pressure, glaucoma, seizures, diabetes, liver, heart, or kidney disease, difficulty with breathing or urination, stomach problems, an overactive thyroid, or a bone marrow disorder.

Similarly, dextromethorphan and promethazine may interact poorly with certain medications, such as diet pills, blood pressure medicines like epinephrine, MAO inhibitors, stimulants like caffeine or ADHD medicine, drugs that make you sleepy, malaria drugs like halofantrine, Tourette's disorder medicine like pimozide, Parkinson's disease medications and other medications that treat cold and allergy symptoms.

If you are pregnant or breastfeeding, you should alert your doctor, as dextromethorphan and promethazine may cause damage to your child's health. Also be aware that dextromethorphan and promethazine may cause serious side effects, ranging from nausea and vomiting to twitches and hallucinations. Additionally, you shouldn't drink alcohol while taking the medication. Finally, you should know that dextromethorphan and promethazine doesn't treat coughs caused by non-cold or allergy sources, such as smoking or asthma.       

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.