To answer your question about the side effects of a drug, it is important to know the specific medication you are referring to, as side effects vary widely between different drugs. Generally, side effects can range from mild to severe and may include symptoms like nausea, dizziness, allergic reactions, or more serious issues depending on the drug.

If you can provide the name of the medication, I can give you detailed information about its common and serious side effects. Meanwhile, always consult your doctor before starting or stopping any medication, and report any unusual symptoms promptly.