Which of the following is a common side effect of metformin?

Metformin is a commonly prescribed medication for the management of type 2 diabetes, and it is associated with several side effects due to its mechanism of action. Nausea is one of the most frequently reported side effects and often occurs, especially when the medication is first started or when the dosage is increased. Many patients may experience gastrointestinal discomfort, including nausea, as their bodies adjust to the medication.

Another side effect often noted is a metallic taste in the mouth, which can occur for various reasons, including the influence of metformin on taste perception. This symptom can be bothersome for some patients but is usually temporary.

Headaches are also a potential side effect that can occur with metformin use, although they are less common compared to gastrointestinal symptoms. The exact reason for headaches in this context can vary, but they could be linked to changes in glucose levels or the effects of the medication itself.

By recognizing that all these symptoms can manifest in patients using metformin, it's clear why selecting all of the options reflects a comprehensive understanding of the common side effects associated with this medication. Therefore, identifying that nausea, headache, and metallic taste can all occur provides a complete view of the side effects of metformin, justifying why choosing all of the above is the