Toshinori Hirai, Masanori Nashi
spp. are common components of normal microbiota in the oral cavity. However, Candida albicans can be a primary cause of superficial infections in the oral cavity and esophagus, especially in immunocompromised individuals. While these infections are rarely life-threatening, they can significantly impair quality of life and, in severe cases, progress to hematogenous dissemination. Oral candidiasis often exhibits as pseudomembranous, erythematous (atrophic), chronic hyperplastic, denture stomatitis, or angular cheilitis. Esophageal candidiasis is typically diagnosed by upper endoscopy, which involves histological examination and brushing. Clinical guidelines recommend topical antifungal agents for mild oral candidiasis, and systemic agents for moderate-to-severe disease or when topical therapy fails. However, azole antifungals pose a substantial risk of drug-drug interactions, primarily due to the inhibition of cytochrome P450 enzymes and drug transporters, which dramatically alters the pharmacokinetics of co-administered drugs. Additionally, amphotericin B, a polyene macrolide antibiotic, may cause nephrotoxicity and electrolyte disturbances (e.g., hypokalemia and hypomagnesemia). Moreover, the co-administration of nephrotoxic drugs may augment the toxicity associated with amphotericin B. Therefore, this review aimed to provide a comprehensive overview of the management of oral and esophageal candidiasis from the viewpoint of clinical pharmacology, with a particular focus on drug-drug interactions and adverse effect profiles.