Hydroxychloroquin Ratiopharm (Hydroxychloroquine Sulfate)

Hydroxychloroquine is used in several infectious and autoimmune disease pathways.

• Malaria: helps eradicate Plasmodium parasites and prevent recurrence.
• Rheumatoid arthritis: reduces joint inflammation and slows disease progression.
• Systemic lupus erythematosus: diminishes disease activity and organ damage risk.

• Hydroxychloroquine accumulates in lysosomes, raising their pH and inhibiting autophagy. This interferes with antigen processing and presentation, leading to modulation of the immune response. It also impairs parasite metabolism by disrupting heme polymerization, contributing to its antimalarial activity.

Hydroxychloroquine may cause a range of adverse reactions.

Common Side Effects

• Nausea: mild to moderate gastrointestinal upset.
• Headache: transient cranial discomfort.
• Dizziness: occasional light‑headedness.
• Skin rash: erythematous or pruritic lesions.
• Abdominal pain: intermittent stomach discomfort.
• Visual disturbances: blurred vision or photophobia.

Serious or Rare Side Effects

• Retinopathy: irreversible vision loss with prolonged use.
• Cardiomyopathy: heart muscle dysfunction, potentially fatal.
• Severe hypoglycaemia: especially in diabetic patients.
• Hemolysis in G6PD deficiency: rapid red blood cell destruction.
• Stevens‑Johnson syndrome: severe skin and mucosal reactions.
• Blood dyscrasias: aplastic anaemia or agranulocytosis.

Before initiating therapy, several safety considerations are recommended.

• Retinal monitoring: schedule baseline and periodic eye examinations.
• Cardiac assessment: evaluate QT interval and cardiac history.
• Renal adjustment: modify dose in patients with impaired kidney function.
• G6PD deficiency: avoid use in individuals with known deficiency.
• Pregnancy counseling: discuss risk‑benefit ratio with pregnant patients.
• Store at room temperature: keep in original packaging, protect from moisture and direct sunlight.

Hydroxychloroquine can interact with various medicines, altering efficacy or safety.

Major Interactions (Avoid)

• Antacids: reduce absorption of hydroxychloroquine.
• Certain anti‑arrhythmics (e.g., amiodarone): increase risk of QT prolongation.
• Digoxin: may raise digoxin serum levels.
• Insulin or oral hypoglycemics: potentiate hypoglycaemia.
• Strong CYP inhibitors (e.g., azithromycin): elevate drug concentrations.

Moderate Interactions (Monitor Closely)

• Warfarin: may increase INR and bleeding risk.
• Methotrexate: potential for heightened toxicity.
• Phenytoin: may alter hydroxychloroquine metabolism.