A 28-year-old man from endemic malaria region in Jharkhand develops fever and is diagnosed with Plasmodium falciparum malaria with severe manifestations. He is started on artesunate. Which is the most common adverse effect of artemisinin derivatives reported in clinical practice?

Explanation

## Most Common Adverse Effect of Artemisinin Derivatives **Key Point:** Transient elevation of liver enzymes (hepatic transaminases) is the most common adverse effect of artemisinin derivatives, occurring in 5–15% of patients, though it is usually mild, asymptomatic, and reversible. ### Safety Profile of Artemisinins | Adverse Effect | Frequency | Severity | Reversibility | Clinical Concern | |---|---|---|---|---| | Transient liver enzyme elevation | 5–15% (most common) | Mild | Reversible | Low—no clinical hepatotoxicity | | Neurotoxicity (ataxia, neuropathy) | <1% (rare) | Severe if occurs | Potentially irreversible | High—rare but serious | | Hemolysis in G6PD deficiency | <1% | Variable | Depends on severity | Moderate—requires screening | | Ototoxicity | <0.5% | Severe | Potentially permanent | High—rare but serious | **High-Yield:** Artemisinin derivatives are remarkably safe in acute malaria therapy. The most common finding is asymptomatic transient liver enzyme elevation, which resolves spontaneously without intervention. ### Mechanism of Transient Hepatic Effects - Mild hepatocyte enzyme induction - No evidence of hepatocellular necrosis - No clinical jaundice or hepatic dysfunction - Resolves within days to weeks after drug discontinuation **Clinical Pearl:** Unlike chloroquine (pruritus) or quinine (ototoxicity), artemisinins have an excellent safety profile. The transient liver enzyme elevation is a laboratory finding without clinical consequences and does not require dose modification or drug discontinuation. ### Rare but Serious Adverse Effects **Warning:** Neurotoxicity (ataxia, neuropathy) has been reported with artemether (intramuscular formulation) in animal studies and rare human cases, particularly with prolonged use. However, this is NOT the most common adverse effect in clinical practice. **Mnemonic:** **ARTS** = **A**rtemisinins are **R**emarkably **T**olerated with **S**afe transient liver enzyme changes. ### Comparison with Other Antimalarials ```mermaid flowchart TD A[Antimalarial Adverse Effects]:::outcome A --> B[Chloroquine]:::action A --> C[Artemisinin]:::action A --> D[Quinine]:::action B --> B1[Pruritus - most common]:::outcome B --> B2[Retinopathy - serious, chronic]:::urgent C --> C1[Transient LFT elevation - most common]:::outcome C --> C2[Neurotoxicity - rare, serious]:::urgent D --> D1[Hypoglycemia, cinchonism]:::outcome D --> D2[Ototoxicity - serious]:::urgent ```