Dextromethorphan
"The label with dosage information is not clear. Under the last bottle I bought, the label was very clear: 10 ml not to exceed 6 doses per day. The new bottle dosage says: 20 ml every 12 hours. So which is it? 10 as needed, or 20 every 12 hours. Plus the direction information is under one of those "peel corner..." tabs. It is very difficult to peel the corner off without destroying the dosage information and directions. I had to call a pharmacist to get an answer as to how much I should take. First pharmacist said  2 Tbls = 10 ml. Then another said 2 tsp = 10 ml. Very confusing label."