Knowing how much medication is in your blood shows how much medication is getting up to your brain, where seizures occur. If seizures are not controlled and the level is low, the dose of medication may have to be increased. If the level is too high, side effects are more common and the dose may be reduced. Some of these are dose-related and occur only when a person is taking high levels of medication. Other side effects may occur regardless of dose and some may be an allergic type of reaction, such as a rash.
Side effects tend to be more common when a drug is just started or a major change in dosage is made.
These side effects may go away after several days. Many people experience no side effects. When you start a medication, ask your doctor about potential side effects and when to report them. If you experience side effects, discuss them with your doctor. Side effects can vary, depending on your medication.