According to Drugs.com, Q-Tussin is an over-the-counter medication that does not contain any narcotics. The active ingredient in Q-Tussin is the expectorant drug guaifenesin, which helps loosen mucus congestion in the chest and throat, allowing people to cough more easily.
Drugs.com states that guaifenesin is suitable for people whose chest congestion is due to allergies, infections or the common cold. The substance is safe enough that it does not require a prescription, but some people are allergic to Q-Tussin and should not take the medication. Anyone with a cough that persists for longer than seven days should seek medical attention.