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Oxycet Side Effects

Generic name: acetaminophen / oxycodone

Medically reviewed by Last updated on Oct 9, 2023.

Note: This document contains side effect information about acetaminophen / oxycodone. Some dosage forms listed on this page may not apply to the brand name Oxycet.

Applies to acetaminophen / oxycodone: oral solution, oral tablet.


Oral route (Tablet; Tablet, Extended Release)

Addiction, Abuse, and MisuseOxycodone/acetaminophen exposes patients and other users to the risks of opioid addiction, abuse, and misuse, which can lead to overdose and death. Assess each patient's risk prior to prescribing oxycodone/acetaminophen, and monitor all patients regularly for the development of these behaviors or conditions.Opioid Analgesic Risk Evaluation and Mitigation Strategy (REMS)To ensure that the benefits of opioid analgesics outweigh the risks of addiction, abuse and misuse, the Food and Drug Administration (FDA) has required a REMS for these products. Under the requirements of the REMS, drug companies with approved opioid analgesic products must make REMS-compliant education programs available to healthcare providers. Healthcare providers are strongly encouraged to: complete a REMS-compliant education program, counsel patients and/or their caregivers, with every prescription, on safe use, serious risks, storage, and disposal of these products, emphasize to patients and their caregivers the importance of reading the Medication Guide every time it is provided by their pharmacists, and consider other tools to improve patient, household, and community safety.Life-Threatening Respiratory DepressionSerious, life-threatening, or fatal respiratory depression may occur with use of oxycodone/acetaminophen. Monitor for respiratory depression, especially during initiation of oxycodone/acetaminophen or following a dose increase.Instruct patients to swallow oxycodone/acetaminophen ER tablets whole; crushing, chewing, or dissolving oxycodone/acetaminophen ER can cause rapid release and absorption of a potentially fatal dose of oxycodone Accidental IngestionAccidental ingestion of even one dose of oxycodone/acetaminophen, especially by children, can result in a fatal overdose of oxycodone.Neonatal Opioid Withdrawal SyndromeProlonged use of oxycodone/acetaminophen during pregnancy can result in neonatal opioid withdrawal syndrome, which may be life-threatening if not recognized and treated, and requires management according to protocols developed by neonatology experts. If opioid use is required for a prolonged period in a pregnant woman, advise the patient of the risk of neonatal opioid withdrawal syndrome and ensure that appropriate treatment will be available.Cytochrome P450 3A4 InteractionThe concomitant use of Oxycodone/acetaminophen with all cytochrome P450 3A4 inhibitors may result in an increase in oxycodone plasma concentrations, which could increase or prolong adverse reactions and may cause potentially fatal respiratory depression. In addition, discontinuation of a concomitantly used cytochrome P450 3A4 inducer may result in an increase in oxycodone plasma concentration. Monitor patients receiving Oxycodone/acetaminophen and any CYP3A4 inhibitor or inducer.HepatotoxicityAcetaminophen has been associated with cases of acute liver failure, at times resulting in liver transplant and death. Most of the cases of liver injury are associated with the use of acetaminophen at doses that exceed 4000 milligrams per day, and often involve more than one acetaminophen-containing product Risks from Concomitant Use with Benzodiazepines or Other CNS DepressantsReserve concomitant prescribing of oxycodone/acetaminophen and benzodiazepines or other CNS depressants for use in patients for whom alternative treatment options are inadequate. Limit dosages and durations to the minimum required. Follow patients for signs and symptoms of respiratory depression and sedation.

Serious side effects of Oxycet

Along with its needed effects, acetaminophen / oxycodone may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.

Check with your doctor immediately if any of the following side effects occur while taking acetaminophen / oxycodone:

More common


Incidence not known

Get emergency help immediately if any of the following symptoms of overdose occur while taking acetaminophen / oxycodone:

Symptoms of overdose

Other side effects of Oxycet

Some side effects of acetaminophen / oxycodone may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects.

Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:

More common

Incidence not known

For Healthcare Professionals

Applies to acetaminophen / oxycodone: oral capsule, oral solution, oral tablet, oral tablet extended release.


The most commonly reported adverse events have included lightheadedness, dizziness, drowsiness, sedation, nausea, and vomiting.[Ref]


Common (1% to 10%): Cough

Frequency not reported: Apnea, respiratory arrest, respiratory depression, hiccups

Postmarketing reports: Bronchospasm, dyspnea, hyperpnea, pulmonary edema, tachypnea, hypoventilation, laryngeal edema[Ref]



Postmarketing reports: Transient elevations of hepatic enzymes, increased bilirubin, hepatic failure, jaundice, hepatotoxicity, hepatic disorder, hepatitis


Frequency not reported: Hepatic necrosis[Ref]

At high doses, the most serious acetaminophen related adverse event is a dose-dependent, potentially fatal hepatic necrosis.[Ref]


Frequency not reported: Skin eruptions, urticaria, erythematous skin reactions

Postmarketing reports: Anaphylaxis, allergic reaction, angioedema[Ref]


Common (1% to 10%): Rash, blister, excoriation, pruritus, erythema

Frequency not reported: Dermatitis, ecchymosis, hyperhidrosis

Postmarketing reports: Urticaria, flushing, increased sweating[Ref]

Nervous system

Very common (10% or more): Dizziness (up to 13%)

Common (1% to 10%): Headache, somnolence

Frequency not reported: Lightheadedness, dizziness, drowsiness, sedation, migraine, myoclonus, paresthesia, tremor

Postmarketing reports: Stupor, cerebral edema, coma, subdural or intracranial hemorrhage, seizures


Postmarketing reports: Serotonin syndrome[Ref]


Frequency not reported: Euphoria, dysphoria, insomnia, altered mood, sleep disorder, withdrawal syndrome

Postmarketing reports: Agitation, confusion, anxiety, mental impairment, drug dependence, drug abuse, depression, nervousness, hallucination, suicide[Ref]


Very common (10% or more): Nausea (up to 31%)

Common (1% to 10%): Vomiting, constipation, dry mouth, dyspepsia, diarrhea

Frequency not reported: Esophageal spasm, oropharyngeal pain, throat irritation

Postmarketing reports: Abdominal pain, abdominal distention, flatulence, gastrointestinal disorder, pancreatitis, intestinal obstruction, ileus, thirst[Ref]



Frequency not reported: Thrombocytopenia, neutropenia, pancytopenia, hemolytic anemia


Rare (0.01% to 0.1%): Agranulocytosis[Ref]


Postmarketing reports: Renal insufficiency and failure[Ref]


Common (1% to 10%): Edema

Frequency not reported: Hypotension, chest discomfort

Postmarketing reports: Tachycardia, dysrhythmias, orthostatic hypotension, bradycardia, palpitations, hypertension[Ref]


Frequency not reported: Decreased appetite

Postmarketing reports: Hypoglycemia, hyperglycemia, acidosis, alkalosis, hyperkalemia, dehydration


Postmarketing reports: Rhabdomyolysis, myalgia


Postmarketing reports: Miosis, visual disturbances, red eye


Common (1% to 10%): Dysuria

Frequency not reported: Urinary retention, interstitial nephritis, proteinuria, decreased urine flow


Postmarketing reports: Malaise, asthenia, fatigue, fever, hypothermia, accidental overdose, non-accidental overdose, hearing loss, tinnitus[Ref]



Postmarketing reports: Adrenal insufficiency, androgen deficiency

Adrenal insufficiency and androgen deficiency have been reported with opioid use, most often with chronic use.


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Further information

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.