The most frequently reported adverse reactions are lightheadedness, dizziness, sedation, nausea and
vomiting. These effects seem to be more prominent in ambulatory than in nonambulatory patients, and
some of these adverse reactions may be alleviated if the patient lies down.
Other adverse reactions include:
Central Nervous Sys tem: Drowsiness, mental clouding, lethargy, impairment of mental and physical
performance, anxiety, fear, dysphoria, psychic dependence, mood changes.
Gas trointes tinal Sys tem: Prolonged administration of hydrocodone bitartrate and acetaminophen tablets
may produce constipation.
Genitourinary Sys tem: Ureteral spasm, spasm of vesical sphincters and urinary retention have been
reported with opiates.
Res piratory Depres s ion: Hydrocodone bitartrate may produce dose-related respiratory depression by
acting directly on the brain stem respiratory centers (see OVERDOSAGE).
Special Sens es : Cases of hearing impairment or permanent loss have been reported predominantly in
patients with chronic overdose.
Dermatological: Skin rash, pruritus.
The following adverse drug events may be borne in mind as potential effects of acetaminophen: allergic
reactions, rash, thrombocytopenia, agranulocytosis.
Potential effects of high dosage are listed in the OVERDOSAGE section.
DRUG ABUSE AND DEPENDENCE
Mis us e, Abus e, and Divers ion of Opioids :
Hydrocodone bitartrate and acetaminophen tablets contain hydrocodone, an opioid agonist, and is a
Schedule II controlled substance. Hydrocodone bitartrate and acetaminophen tablets, and other opioids,
used in analgesia can be abused and are subject to criminal diversion.
Addiction is a primary, chronic, neurobiologic disease, with genetic, psychosocial, and environmental
factors influencing its development and manifestations. It is characterized by behaviors that include one
or more of the following: impaired control over drug use, compulsive use, continued use despite harm,
and craving. Drug addiction is a treatable disease utilizing a multidisciplinary approach, but relapse is
common.
"Drug seeking" behavior is very common in addicts and drug abusers. Drug-seeking tactics include
emergency calls or visits near the end of office hours, refusal to undergo appropriate examination,
testing or referral, repeated "loss" of prescriptions, tampering with prescriptions and reluctance to
provide prior medical records or contact information for other treating physician(s). "Doctor shopping"
to obtain additional prescriptions is common among drug abusers and people suffering from untreated
addiction.
Abuse and addiction are separate and distinct from physical dependence and tolerance. Physical
dependence usually assumes clinically significant dimensions only after several weeks of continued
opioid use, although a mild degree of physical dependence may develop after a few days of opioid
therapy. Tolerance, in which increasingly large doses are required in order to produce the same degree
of analgesia, is manifested initially by a shortened duration of analgesic effect, and subsequently by
decreases in the intensity of analgesia. The rate of development of tolerance varies among patients.
Physicians should be aware that abuse of opioids can occur in the absence of true addiction and is
characterized by misuse for non-medical purposes, often in combination with other psychoactive
substances. Hydrocodone bitartrate and acetaminophen tablets, like other opioids, may be diverted for
non-medical use. Record-keeping of prescribing information, including quantity, frequency, and renewal
requests is strongly advised.
Proper assessment of the patient, proper prescribing practices, periodic re-evaluation of therapy, and
proper dispensing and storage are appropriate measures that help to limit abuse of opioid drugs.