Drug tolerability affects compliance. We evaluated the tolerability levels of azithromycin (750-mg loading dose plus 250 mg/day; n ؍ 148 subjects), doxycycline (100 mg/day; n ؍ 75), and placebo (n ؍ 77) as prophylaxis against malaria in Indonesian adults over 20 weeks. Self-reported and elicited symptoms, health perception, hearing, hematology, and biochemistry were assessed. The loading dose was well tolerated. Prolonged drug use for disease prophylaxis, treatment, or suppression should be well tolerated. This is especially true for healthy recipients of prophylaxis, such as travelers and pregnant women, for whom the risk-to-benefit ratio requires both safe and easily tolerable regimens.Azithromycin has several clinical indications that include the treatment and prophylaxis of Mycobacterium avium-M. intracellulare complex (MAC) infection and the treatment of community-acquired pneumonia and genital or ocular Chlamydia trachomatis infection (25). The standard doses of azithromycin (30 mg/kg of body weight for children and 1.5 g total dose for adults) are well tolerated. Up to 12% of patients report any symptom, Ͻ10% report gastrointestinal symptoms, and 0.7 to 1.3% discontinue therapy. Such tolerability compares favorably to that of other antibiotics (7,11,12,22). High doses of azithromycin, 1 g/kg for adults and 20 mg/kg for children, are also well tolerated (2, 16). However, doses used for MAC infections (1.2 g/week or 300 to 600 mg/day) are less well tolerated (3, 9, 10, 17). Gastrointestinal symptoms are reported by a high proportion of patients (e.g., by 71 [78.9%] of 85 recipients of weekly azithromycin, resulting in six [7%] withdrawals [17]). Hearing loss in the speech frequency range has also been reported in 13 to 17% of patients with MAC infections. It is dose dependent and recovers within 2 to 11 weeks after discontinuation of the drug (3,9,23,24). Irreversible high-frequency-hearing loss has also been reported following treatment with 750 mg of oral azithromycin in a 37-year-old woman (19). Biochemical and hematological assessments in large clinical series have been unremarkable. Mild elevations of liver enzymes (0.3 to 1.7%) and transient neutropenia (1.5%) or neutrophilia (1.5%) have been documented (11). Significant hepatotoxicity (e.g., hypersensitivity hepatitis, cholestasis) is rare (4, 15), as are anaphylaxis, pseudomembranous colitis, erythema multiforme, and Churg-Strauss syndrome (12,13,22).One trial has previously assessed azithromycin as prophylaxis against malaria. Azithromycin was administered daily (250 mg) or weekly (1 g) for 13 weeks to Kenyan adults. The reported symptoms were similar to those of placebo recipients, and there was no evidence of toxicity on routine hematological or biochemical testing (1).We report the tolerability of daily-administered azithromycin as prophylaxis against malaria in Indonesian adults.
MATERIALS AND METHODSSubjects and study conduct. This double-blind, placebo-controlled trial assessed the prophylactic efficacy and tolerability of azithromycin ...