Pharmacological Side Effects

noun a sudden, violent, irregular movement of a limb or of the body, caused by involuntary contraction of muscles and associated especially with brain disorders such as epilepsy, the presence of certain toxins or other agents in the blood, or fever

• The patient experienced a convulsion as a result of the seizure.
• He had a convulsion during the night and scared everyone in the house.
• I heard she had a major convulsion at the party last night.
• The sudden convulsion of laughter caught everyone by surprise.

noun a sensory perception that has no basis in external reality, typically as a result of a mental disorder or the effects of a drug

• The patient experienced a visual hallucination, seeing things that were not actually there.
• I thought I saw a ghost last night, but it turned out to be just a hallucination.
• Don't worry, it was just a hallucination, you're not going crazy.
• The mirage in the desert was like a hallucination, appearing and disappearing in the heat.