The problem for you is that there are *two* components to a malpractice claim. First is liability or fault; for purposes of this answer, let's assume that there is liability--that what they did was wrongful. Second, though, is damages--how you were injured. The law does not generally provide compensation "merely" for having your rights violated; rather, it provides compensation for the economic costs or losses, or the injuries/damage, you suffered. If you were sedated but did not suffer some long-lasting illness or damage from that, there is no point in suing: not only can you not receive compensation when there is no injury or damage, but a malpractice suit can be *very* expensive, since you MUST hire  a medical expert to write a report and/or testify, and such experts typically cost thousands of dollars; hence, without some significant injuries, etc., you could pay for more for the lawsuit then you will get back.