What side effect is commonly associated with metronidazole?

Metronidazole is an antibacterial and antiprotozoal medication that is often prescribed to treat infections caused by anaerobic bacteria and certain parasites. A commonly reported side effect is a metallic taste in the mouth. This phenomenon occurs because metronidazole interacts with taste receptors, leading to the alteration of taste perception. This can be bothersome for some patients but is generally not serious and may resolve after the medication is discontinued.

The presence of a metallic taste can also signal that the medication is being absorbed and is working in the body, even if it's an unpleasant side effect. Identifying this side effect is important for healthcare providers as they counsel patients regarding what to expect during treatment with metronidazole. This allows for better management of side effects and can improve patient adherence to the medication regimen.

Other side effects, although they may occur, are less characteristic of metronidazole. Increase in appetite, fatigue, and weight gain do not have robust evidence linking them specifically to metronidazole, making them less typical compared to the distinctive metallic taste. Understanding the specific side effects of medications helps in monitoring patient response and managing any adverse effects effectively.