If i take one lorazepam 0.5 mg to handle one stressful activity (about 7 hours duration) how many hours later can i take another one if i still feel anxious?

You should follow the directions on the prescription. The instructions your doctor gave on the bottle should tell you how often you can take this medicine since this varies depending on a lot of factors. If the bottle’s instructions doesn’t answer this question, then call your doctor to find out how often you can take this medication. Good luck!