Does Ativan Intake Cause Hallucinations?

can a 2mg of Ativan times daily have a person hallucinate and how long does it last after taken it. My husband is in the hospital he has a ten % of his heart working and he just had surgery to have all his teeth taken out the dr. took him off his coumadin for the surgery and didn't put him back on until three days a go and now he has a systolic blood clot in his right bysep in a small vain can that cause a heart attack or what can it do to him