An older-adult patient is visiting the clinic after a fall during the night. The nurse obtains information on what medications the patient takes. Which medication most likely contributed to the patient’s fall?

Choice A reason: Melatonin, used for sleep regulation, may cause mild drowsiness but is not strongly linked to falls in older adults. Its side effects are minimal, and it does not significantly impair balance or coordination. This medication is unlikely to have caused the fall, making it an incorrect choice. Choice B reason: Benzodiazepines, used for anxiety or insomnia, increase fall risk in older adults by causing sedation, dizziness, and impaired coordination. These effects, especially at night, can lead to balance issues and falls. Given their known association with falls in the elderly, this is the most likely medication contributing to the incident. Choice C reason: L-tryptophan, an amino acid supplement for sleep or mood, has minimal side effects and is not associated with significant sedation or balance impairment. It is unlikely to cause falls in older adults, as it does not affect motor function or coordination, making this an incorrect choice. Choice D reason: Iron supplements treat anemia but do not cause sedation, dizziness, or balance issues linked to falls. Side effects like gastrointestinal upset are unrelated to fall risk. This medication is not a likely contributor to the patient’s fall, making it an incorrect choice compared to benzodiazepines.