The injection is administered either in the back of your hand or in your arm. The dose depends on the amount of treatment needed and how long it takes to complete. After the injection, you become drowsy and unaware of any treatment, but you are still able to communicate. The effects of a sedative medicine take some time to wear off and you are told how long the drugs take to clear from your body. You won't be able to drink alcohol, drive or work machinery during this time. Certain things can affect a patient's suitability for this type of sedation such as weight, age and medical condition.