Which side effect is commonly associated with Metronidazole?

The commonly associated side effect of Metronidazole is black hairy tongue. This condition occurs due to the alteration of the normal balance of bacteria in the mouth or by the accumulation of dead cells and bacteria on the surface of the tongue. The antibiotic can disrupt oral flora, leading to overgrowth of certain bacteria that may contribute to this discoloration and texture change.

In addition to black hairy tongue, Metronidazole can also lead to other gastrointestinal side effects such as nausea and vomiting, but these are not as distinctive and characteristic as the occurrence of black hairy tongue. It is important for healthcare providers to inform patients about this potential side effect, as it can be concerning to those unfamiliar with it. Understanding these side effects can help in managing expectations and ensuring adherence to the treatment regimen.