Final answer:
Contradications for dimenhydrinate include hypersensitivity, severe liver disease, glaucoma, urinary retention, and gastrointestinal obstruction. It should be used cautiously in patients with asthma, hyperthyroidism, cardiovascular disease, or hypertension.
Step-by-step explanation:
The question pertains to the contraindications for using dimenhydrinate, an antihistamine commonly used to prevent and treat motion sickness and nausea. While dimenhydrinate is generally considered safe for many individuals, there are certain situations where its use is not advised. Contraindications for dimenhydrinate may include known hypersensitivity to the drug, presence of severe liver disease, glaucoma, urinary retention, or an obstruction in the gastrointestinal tract where increased activity could be harmful.
It is also important to note that antihistamines like dimenhydrinate can cause drowsiness and may impair one's ability to perform tasks requiring mental alertness, such as driving. Additionally, dimenhydrinate should be used with caution in individuals with asthma, hyperthyroidism, cardiovascular disease, or hypertension.