Antihistamine-Induced Sedation

Introduction to Sedation Effects

• First-generation antihistamines like dimenhydrinate are associated with sedative effects, including drowsiness and/or performance impairment, in many patients, according to clinical practice guidelines 1

Safety Concerns and Implications

• Patients taking dimenhydrinate may experience impaired driving performance and increased risk of accidents 1
• Workers taking first-generation antihistamines like dimenhydrinate show impaired work performance and productivity 1
• The sedative effects of both medications can be enhanced when combined with other CNS depressants like alcohol, sedatives, or antidepressants 1

Medication Selection and Patient Considerations

• For elderly patients, extra caution should be used with either medication, but particularly with dimenhydrinate, as older adults are more sensitive to psychomotor impairment 1
• Patients operating machinery or vehicles should be warned about the potential for impairment with both medications, but especially with dimenhydrinate 1

Special Considerations and Precautions

• Performance impairment can exist without subjective awareness of drowsiness 1
• Both medications should be used with caution in older adults who are more sensitive to psychomotor impairment 1