Relieve your painful cold and flu symptoms while soothing your throat with a gentle warming sensation with TYLENOL® Cold & Flu Severe with Honey Lemon Warming Liquid. Before taking acetaminophen and codeine, tell your doctor and pharmacist if you are allergic to acetaminophen, codeine, sulfite, any other medications, or any of the ingredients in acetaminophen and codeine products. TYLENOL ® with Codeine is supplied in tablet form for oral administration. Acetaminophen, 4'-hydroxyacetanilide, a slightly bitter, white, odorless, crystalline powder, is a non-opiate, non-salicylate analgesic and antipyretic. What should I avoid while taking Tylenol Cold & Flu Severe? Avoid drinking alcohol. It may increase your risk of liver damage while you are taking acetaminophen. Relieves minor aches and pains while helping you fall asleep and is non-habit forming when used as directed. Use Only as Directed About 150 Americans a year die by accidentally taking too much acetaminophen, the active ingredient in Tylenol. The toll does not have to be so high. Common nervous system side effects include sedation, confusion, dizziness, sweating, clamminess, light-headedness, tiredness, headache and a feeling you are floating or about to fall. Medscape - Indication-specific dosing for Tylenol with Codeine, Tylenol 3 (codeine/acetaminophen), frequency-based adverse effects, comprehensive interactions, contraindications, pregnancy & lactation schedules, and cost information. you know, i would really like to know myself.as far as the tylenol 3 versus the hydro. im on my fifth day of w/d from 120mg. daily of hydro. Consumer information about the medication ACETAMINOPHEN/CODEINE - ORAL (Tylenol-Codeine No.3, Tylenol-Codeine No.4, Vopac), includes side effects, drug interactions, recommended dosages, and storage information. Read more about the prescription drug ACETAMINOPHEN/CODEINE - ORAL.