Signs and Symptoms
Symptoms of mild cinchonism (which may occur from standard therapeutic doses of quinine) include flushed and sweaty skin, ringing of the ears (tinnitus), blurred vision, impaired hearing, confusion, reversible high-frequency hearing loss, headache, abdominal pain, rashes, drug-induced lichenoid reaction (lichenoid photosensitivity), vertigo, dizziness, dysphoria, nausea, vomiting and diarrhea.
Large doses of quinine may lead to severe symptoms of cinchonism: skin rashes, deafness (reversible), somnolence, diminished visual acuity or blindness, anaphylactic shock, and disturbances in cardiac rhythm or conduction, death from cardiotoxicity. Quinine may also trigger a rare form of hypersensitivity reaction in malaria patients termed blackwater fever that results in massive hemolysis, hemoglobinemia, hemoglobinuria, and renal failure.
Patients treated with quinine may also suffer from hypoglycemia (especially if administered intravenously) and hypotension (low blood pressure).
Most symptoms of cinchonism (except in severe cases) are reversible and disappear once quinine is withdrawn.
Quinine, like chloroquine, inactivates enzymes in the lysosomes of cells, and has an anti-inflammatory effect, hence its use in rheumatoid arthritis. However switching off these enzymes can also cause abnormal accumulation of glycogen and phospholipids in lysosomes, causing a toxic myopathy. It is possible this is the root cause of cinchonism.
Read more about this topic: Cinchonism
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