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Related Experiment Videos

Quinine associated blindness.

Bradley Scott Townend1, Jonathan William Sturm, Scott Whyte

  • 1Neurology Department, Gosford Hospital, New South Wales. btownend@doh.health.nsw.gov.au

Australian Family Physician
|September 18, 2004
PubMed
Summary

Quinine, used for leg cramps, can cause serious side effects like blindness. Careful monitoring and risk-benefit analysis are crucial when prescribing this medication.

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Area of Science:

  • Pharmacology
  • Ophthalmology
  • Geriatrics

Background:

  • Quinine is frequently prescribed for elderly patients experiencing benign nocturnal leg cramps.
  • Despite its common use, quinine administration carries potential risks and complications.

Observation:

  • This article details a case of quinine toxicity resulting in bilateral blindness.
  • The case highlights the severe adverse reactions that can occur with quinine use.

Findings:

  • Visual loss is linked to quinine serum concentrations exceeding 10 microg/mL, significantly above the therapeutic range (2-5 microg/mL).
  • Other reported adverse reactions include neurological disturbances, hemolysis, acute renal failure, and cardiac arrhythmias.
  • Evidence regarding quinine's efficacy for leg cramps is mixed, though meta-analyses suggest some benefit.

Implications:

  • Prescribers must consider the risk of overdose and conduct individualized risk-benefit assessments for each patient.
  • Close monitoring of benefits and adverse reactions is essential, with discontinuation advised if necessary.

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