"Heavy sedation" refers to a strong and deep state of relaxation caused by medication, where a person feels very calm and sleepy, often used to reduce pain or anxiety during medical procedures. Full definition
After the spill Karin's 17 - year - old brother Charlie, who works as a groom at Pimlico, produced a penciled note that he said his sister had scribbled before being put under heavy sedation at the hospital. (si.com)
In the first two weeks, he required heavy sedation so we were not allowed to do anything that could excite him too much, since he had many tubes and wires attached to him; and of course, the risk of complications with infections. (ghanapoliticsonline.com)
If radiographs (x-rays) are needed, your pet needs to be very still in order to get good images, and this is unlikely without heavy sedation or anesthesia. (edmondeastvet.com)