Does hypnotherapy involve taking any hallucinogens?

No hallucinogens... Hypnotherapy is a method used to manage and treat many conditions. It is the discipline of using suggestions to the unconscious mind to implement change in behavior or in the way the body reacts to stimuli. Anxiety, pain, insomnia, fibromyalgia, headaches, weight loss, smoking cessation, and irritable bowel syndrome are just a few conditions hypnotherapy is used for.
No. Hypnotherapy does not involve taking any medication, just talking.
No. Hypnosis is drug free, although conditions being treated, such as chronic pain, may also require some drug therapy.
No. No I would not recommend this. However there are studies ongoing for the use of mdma ie. "ecstasy" to aid in therapy and counselling so perhaps ther could be a role with close monitioring down the road.