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[Subacute chloroquine overdosage].

F R Ochsendorf¹, U Runne

¹Abteilung II, Zentrum der Dermatologie und Venerologie, Klinikum der Universität Frankfurt/Main.

Deutsche Medizinische Wochenschrift (1946)

|October 4, 1991

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A man experienced severe side effects from taking too much chloroquine for malaria prevention. This case highlights the full range of adverse reactions from subacute chloroquine overdosage.

Area of Science:

Pharmacology
Toxicology
Ophthalmology

Background:

Chloroquine is an antimalarial drug used for malaria prevention.
Incorrect dosing can lead to significant adverse effects.
Understanding overdose symptoms is crucial for patient safety.

Observation:

A 26-year-old man self-administered 1.0 g of chloroquine daily, exceeding the recommended weekly dose.
Symptoms included vertigo, weakness, severe photosensitivity, hair depigmentation, and vision disturbances (abnormal accommodation, diplopia).

Findings:

The patient exhibited a wide spectrum of subacute chloroquine toxicity.
All symptoms resolved within weeks to months after discontinuing the medication.
Hair color returned to normal after 8 weeks, and other symptoms resolved faster.

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Implications:

This case underscores the importance of correct chloroquine dosage for malaria prevention.
It demonstrates the potential for severe, reversible toxicity with chronic overexposure.
Highlights the need for patient education on medication use and potential side effects.