Which treatment is used for fungal infections in otitis externa?

Amphotericin B is a suitable treatment for fungal infections in otitis externa, particularly in cases where the infection is caused by one of the more common fungal pathogens, such as Candida or Aspergillus species. This antifungal medication works by binding to ergosterol, a key component of fungal cell membranes, leading to increased permeability and ultimately causing cell death.

In contrast, the other options provided are primarily used for bacterial infections rather than fungal ones. Ciprofloxacin, for example, is a fluoroquinolone antibiotic targeting bacterial pathogens, and aminoglycoside combinations are also antibiotics effective primarily against bacteria. Oral antibiotics are used for systemic bacterial infections rather than localized fungal infections in the ear. Therefore, Amphotericin B is the most appropriate choice for treating fungal infections in otitis externa due to its specific antifungal action.