Darvon Side Effects
Generic Name: propoxyphene
Note: This document contains side effect information about propoxyphene. Some of the dosage forms listed on this page may not apply to the brand name Darvon.
Applies to propoxyphene: oral capsule, oral tablet
In general, the adverse effects of propoxyphene (the active ingredient contained in Darvon) may be more likely and more severe in patients with renal and/or liver disease.
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) 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) 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) 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]
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) (however, other causes of diabetes insipidus in that patient were not rigorously excluded).[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]
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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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.