Vicodin hydrocodone is an antitussive treatment of moderately severe pain. It is a prescription tablet of hydrocodone & Acetaminophen.continued Vicodin use could lead to increased tolerance & dependence buy vicodin online is a controlled substance by the dea & is a narcotic that is intended to be used to treat moderate to moderately severe pain.The individual may believe they cannot manage without the vicodin, & continue using it.The obvious negative effects are the potential for addiction & liver damage side effect of common vicodin like dizziness, Itching, weakness, constipation, swelling etc. the patient body becomes less to responsive to the drug’s effects.