In case of an emergency, you need to get evacuated by helicopter to Kathmandu, you need to take proper care of your health. Anyway, you will find small clinics along the trek. There are major hospitals in Kathmandu, Pokhara and Chitwan. However, you need to bring your medicine (if any) and a first aid box will be provided by Nepal Sanctuary Treks, also your guide will be trained for first aid in case of emergency.
For further inquiries, you can contact Nepal Sanctuary Treks at: email@example.com or firstname.lastname@example.org