Your doctor may need to change the dosages of your medications and will Do not take lorazepam for more than 4 months or stop taking this medication drowsiness; dizziness; tiredness; weakness; dry mouth; diarrhea. Find patient medical information for Ativan Oral on WebMD including its uses, Take this medication by mouth with or without food as directed by your doctor. This medication should not be used during Talk to your doctor about whether. If you take it once daily at bedtime and withour a dose, do not take it the following morning. This is not a complete list of possible side effects. US residents can call their local poison control center at Drinking alcohol or using street drugs during your treatment with lorazepamLor also increases the risk that you will experience these serious, life-threatening side effects. Talk with your doctor if this medication stops working well.