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Chloroquine retinopathy is a form of toxic retinopathy (damage of the retina) caused by the drugs chloroquine or hydroxychloroquine, which are sometimes used in the treatment of autoimmune disorders such as rheumatoid arthritis and systemic lupus erythematosus. This eye toxicity limits long-term use of the drugs. [3]
Other uses include treatment of rheumatoid arthritis, lupus, and porphyria cutanea tarda. It is taken by mouth, often in the form of hydroxychloroquine sulfate. [3] Common side effects may include vomiting, headache, blurred vision, and muscle weakness. [3] Severe side effects may include allergic reactions, retinopathy, and irregular heart rate.
Serious side effects include problems with vision, muscle damage, seizures, and low blood cell levels. [ 1 ] [ 4 ] Chloroquine is a member of the drug class 4-aminoquinoline . [ 1 ] As an antimalarial, it works against the asexual form of the malaria parasite in the stage of its life cycle within the red blood cell . [ 1 ]
In particular, quinoline-type drugs are known to be ototoxic. Examples include chloroquine and hydroxychloroquine which are quinine-like. Apart from antimalarial effects, these drugs are also used in the treatment of other diseases such as dermatological, immunological, rheumatological, and severe infectious diseases. [25]
Hydroxychloroquine is more commonly available than chloroquine in the United States. [13] Hydroxychloroquine is used as a prophylactic in India. [24] [25] Hydroxychloroquine and chloroquine have numerous, potentially serious, side effects, such as retinopathy, hypoglycemia, or life-threatening arrhythmia and cardiomyopathy. [26]
Type A: augmented pharmacological effects, which are dose-dependent and predictable [5]; Type A reactions, which constitute approximately 80% of adverse drug reactions, are usually a consequence of the drug's primary pharmacological effect (e.g., bleeding when using the anticoagulant warfarin) or a low therapeutic index of the drug (e.g., nausea from digoxin), and they are therefore predictable.
The primary treatment for megavitamin-B 6 syndrome is to stop taking supplemental vitamin B 6. [14] Physical therapy, including vestibular rehabilitation, has been used in attempts to improve recovery following cessation of vitamin B 6 supplementation. [51] [11] Medications such as amitriptyline have been used to help with neuropathic pain. [19]
Alcohol can exacerbate the symptoms and may directly contribute to increased severity of symptoms. The reasons for toxicity vary depending on the mixture of drugs. Usually, most victims die after using two or more drugs in combination that suppress breathing, and the low blood oxygen level causes brain death.
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