Lectrazine was used to stabilize the cardiovascular and renal systems of humanoids. It could also be combined with hyronalin for temporary protection against radiation poisoning.
In 2371, The Doctor administered twenty milligrams of lectrazine to Tuvok after the Vulcan began having convulsions in main engineering. (VOY: "Fury")
The following year, The Doctor administered twenty milligrams of lectrazine to the Vidiian doctor Denara Pel in order to stabilize her cardiovascular and renal systems. (VOY: "Lifesigns")
In 2373, The Doctor gave Kes lectrazine to counteract the disruptions in her cardiac functions. (VOY: "Sacred Ground") Kes attempted to give Tieran twenty milligrams of lectrazine in order to save his life, but Tieran's biochemistry was incompatible with the medication. (VOY: "Warlord") The Doctor gave Lieutenant Tom Paris a combination of lectrazine and hyronalin to temporarily protect him from radiation poisoning. (VOY: "Real Life")
In 2374, The Doctor gave twenty milligrams of lectrazine to a member of the bridge crew when she was in hypertensive shock. (VOY: "Scientific Method")