A side effect of tonsillitis is fever.
Carbamazepine is an approved treatment for bipolar disorder and epileptic seizures, but it has side effects useful in treating attention-deficit hyperactivity disorder (ADHD), schizophrenia, phantom limb syndrome, paroxysmal extreme pain disorder, neuromyotonia, and post-traumatic stress disorder
 That is, the frequency describes how often symptoms appear after taking the drug, not caused by the drug

