Darvon-N Side Effects
Generic Name: propoxyphene
Note: This page contains information about the side effects of propoxyphene. Some of the dosage forms included on this document may not apply to the brand name Darvon-N.
For the Consumer
Applies to propoxyphene: capsules, tablets
Check with your doctor if any of these most COMMON side effects persist or become bothersome:
Seek medical attention right away if any of these SEVERE side effects occur while taking propoxyphene (the active ingredient contained in Darvon-N)
Constipation; dizziness; drowsiness; lightheadedness; nausea; vomiting.
Severe allergic reactions (rash; hives; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); anxiety; cold or clammy skin; confusion; excessive sweating; hallucinations; loss of appetite; loss of consciousness; mental or mood changes; seizures; severe drowsiness or dizziness; severe or persistent stomach pain; vision changes; weakness; yellowing of the skin or eyes.
For Healthcare Professionals
Applies to propoxyphene: oral capsule, oral tablet
In general, the adverse effects of propoxyphene (the active ingredient contained in Darvon-N) may be more likely and more severe in patients with renal and/or liver disease.
General side effects including drug tolerance and influenza type illness have been reported.[Ref]
Nervous system side effects have included dizziness, sedation, stupor, delirium, somnolence, ataxia, coma, syncope, and respiratory depression. The sedative effects of propoxyphene (the active ingredient contained in Darvon-N) have been associated with a 60% increased risk of hip fracture in elderly patients.[Ref]
Other side effects have included dependence (although the abuse liability of propoxyphene (the active ingredient contained in Darvon-N) is less than that of some other narcotic analgesics). Withdrawal symptoms after either abrupt cessation or fast tapering may occur and include agitation, restlessness, anxiety, insomnia, tremor, tachycardia, hallucinations, psychosis, abdominal cramps, vomiting, sweating, and seizures.
Drug toxicity, multiple drug overdose, and narcotic overdose have also been reported.
Sensorineural deafness has been reported following chronic abuse and/or large doses of propoxyphene-containing compounds. Optic atrophy has been reported following overdose.[Ref]
Some of the cardiotoxic effects reported in association with propoxyphene (the active ingredient contained in Darvon-N) may be attributable to its major active metabolite, norpropoxyphene.[Ref]
Cardiovascular side effects have included arrhythmia, bradycardia, cardiac/respiratory arrest, congestive arrest, congestive heart failure (CHF), tachycardia, myocardial infarction (MI), hypotension, decreased blood pressure, elevated heart rate, abnormal heart rate, and dizziness. A variety of arrhythmias (including heart block) have been reported most often in association with propoxyphene overdose.[Ref]
Gastrointestinal side effects have included nausea, vomiting, and constipation which have been relatively common. Gastrointestinal bleeding and acute pancreatitis have also been reported.[Ref]
A case of ischemic colitis has been reported following an overdose of propoxyphene which was complicated by severe hypotension.[Ref]
Genitourinary side effects including a case of retroperitoneal fibrosis have been reported.[Ref]
Dermatologic side effects including rashes and itch have been reported.[Ref]
Renal side effects have included a single case of nephrogenic diabetes insipidus following an overdose of propoxyphene (the active ingredient contained in Darvon-N) (however, other causes of diabetes insipidus in that patient were not rigorously excluded).[Ref]
Hepatic side effects have included elevated liver function tests, jaundice, hepatic steatosis, hepatomegaly, hepatocellular injury, and hepatotoxicity.[Ref]
Hematologic side effects have rarely included cases of hemolytic anemia, pancytopenia, and disseminated intravascular coagulation after administration (or abuse) of propoxyphene-containing compounds.[Ref]
Local side effects have included inadvertent intra-arterial injection with ensuing vascular compromise and distal necrosis has been reported in propoxyphene-abusing patients.[Ref]
Musculoskeletal side effects including myopathy and rhabdomyolysis have been reported after chronic oral use. Fibrous myopathy has also been reported in propoxyphene-abusing patients who administered the drug via intramuscular injection.[Ref]
Metabolic side effects including metabolic acidosis have been reported. Cases of severe hypoglycemia have been reported in patients with chronic renal failure.[Ref]
Ocular side effects including eye swelling and vision blurred have been reported.
Hypersensitivity side effects have been reported.[Ref]
Psychiatric side effects including abnormal behavior, confusional state, hallucinations, and mental status change have been reported.
Respiratory side effects including dyspnea have been reported.
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Not all side effects for Darvon-N may be reported. You should always consult a doctor or healthcare professional for medical advice. Side effects can be reported to the FDA here.
More about Darvon-N (propoxyphene)
- Other brands: Darvon
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