Send your cold and flu away with Mucinex Fast-Max Cold, Flu & Sore Throat Caplets, so you can feel better and move on. Mucinex Fast-Max Caplets. Mucinex Fast-Max Cold, Flu & Sore throat Caplets combine the mucus-busting power of Mucinex and other maximum strength medicines to relieve headache, fever, and nasal congestion, control cough, and break up and thin the mucus that causes chest congestion.