Morathial was a drug, similar to leporazine, that was used to treat medical patients who suffered cardiac arrest. It was considered safer than borathium, since it was less likely to cause neural metaphasic shock.
Toby Russell used borathium on a seriously-injured survivor of the USS Denver disaster in 2368, although morathial may have been effective. The survivor later died from neural metaphasic shock, but Russell was content with the fact that she gained valuable data which would allow her to improve borathium. She felt she was justified in sacrificing one patient to potentially save thousands in the future. Dr. Beverly Crusher was not happy with Dr. Russell's decision, and relieved her of medical duty aboard the USS Enterprise-D following the incident. (TNG: "Ethics")