A nurse is caring for an 82-year-old male with a history of mild kidney dysfunction who is recently admitted to the hospital for an unwitnessed fall. The nurse noted that the client had been taking cimetidine (Tagamet HB) at the maximum dosage for 2 months. Which of the following are complications of this cimetidine (Tagamet HB) that contributed to his admission? (Select All That Apply.)

The correct answers are B (Lethargy) and D (Confusion). Cimetidine is an H2 receptor antagonist that can lead to central nervous system side effects in the elderly due to reduced metabolism and elimination. Lethargy is a common side effect, as the drug can cross the blood-brain barrier, causing sedation and fatigue. Confusion can also occur due to its anticholinergic effects, leading to cognitive impairment. Restlessness and increased libido are not typically associated with cimetidine use. In summary, the client's lethargy and confusion are likely complications of cimetidine contributing to his hospital admission.