A member asked:

I took some benylin (dextromethorphan) extra strength that had already expired. what is this going to do to me?

A doctor has provided 1 answer
Dr. Edward Smith answered

Specializes in Neurology

Nothing bad: After a certain period of time, drugs lose potency. The rate at which a drug can be expected to "expire" is generally when it reaches 90% of labeled strength. A very few drugs, especially "biologicals", may become toxic. Check with your pharmacist about this. Benylin's ingredients don't become toxic as they age (provided storage requirements such as temperature, sunlight & humidity are maintained).

Answered 9/8/2018

5.7k views

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