Yes, you can refuse a treatment or ask for more information or more time to decide. The anaesthetist will discuss the benefits, risks, and your preferences with you, and you can decide together which anaesthetic is best for you when there is a choice. Nothing will happen until you understand and consent, which means give permission, to what has been planned. For some surgeries or health conditions, only one type of anaesthetic may be appropriate, and your safety is the most important factor. Verify the exact plan with your surgical or anesthesia team in case they want something different for you.