2 doctors weighed in:
I took some benylin (dextromethorphan) extra strength that had already expired. What is this going to do to me?
2 doctors weighed in

Dr. Edward Smith
Neurology
1 doctor agrees
In brief: 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).

In brief: 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).
Dr. Edward Smith
Dr. Edward Smith
Thank
Read more answers from doctors