Ativan and klonopin along with cannabis do have a moderate interaction meaning they can be taken together but you must be careful and look out for side effects. The combination may cause dizziness, drowsiness, confusion, and difficulty concentrating. You may also experience impairment in thinking, judgment, and motor coordination. You should avoid or limit the use of alcohol while being treated with these medications. Try to avoid activities requiring mental alertness such as driving or operating hazardous machinery until you know how the medications affect you.