AT: "xx" Inaprovaline was a synaptic stimulant and cardiostimulant. It worked by fortifying the cell membranes and could be used as a preventative measure or in response to various physical illnesses. Chloromydride was a stronger version of inaprovaline.
In 2151, while exploring an uncharted M-class planet, several of the crew of Enterprise became affected by tropolisine. Doctor Phlox discovered that inaprovaline, combined with being removed from the pollen-saturated environment, would allow the delusional effects of tropolisine to dissipate. (ENT: "Strange New World")
Also in 2151, while the crew of the Vahklas was aboard the Enterprise, T'Pol went to bed without meditating. Her dreams were unsettling and she was agitated upon awaking, so she asked Doctor Phlox for 25 milligrams of inaprovaline to calm her nerves. (ENT: "Fusion")
In 2366, the Zalkonian "John Doe" crash-landed on a planet and was rescued by the USS Enterprise-D. Suffering from low autonomic responses, Dr. Beverly Crusher gave "John Doe" sixty ccs of inaprovaline. (TNG: "Transfigurations")
When Worf began to lose brain function following his surgery involving the genitronic replicator in 2368, Dr. Crusher injected him with forty ccs of inaprovaline and then seventy-five ccs more. The drug did not have an effect, forcing her to try chloromydride. (TNG: "Ethics")
When Jean-Luc Picard was injured by a Lenarian at a diplomatic conference in 2369, Dr. Crusher injected him with forty ccs of inaprovaline. (TNG: "Tapestry")
Inaprovaline was administered to a patient in a field hospital on Ajilon Prime in 2373. (DS9: "Nor the Battle to the Strong")
In an alternate timeline experienced by the Voyager crew in 2374, The Doctor instructed Tom Paris to treat a crewmember with damaged lung tissue with inaprovaline. (VOY: "Year of Hell")
In 2375, The Doctor gave inaprovaline to Seven of Nine after she had been intoxicated by a single glass of champagne. Later that year he administered 2 milligrams of inaprovaline to B'Elanna Torres to counter her cytotoxic shock. (VOY: "Timeless", "Nothing Human")
Not long after, The Doctor administered 20 milligrams of inaprovaline to Tuvok after he was attacked by members of Yost's species on a planet within a subspace sinkhole. (VOY: "Gravity")
The same year, the Doctor also gave 20 milligrams of inaprovaline to Captain Kathryn Janeway to cure her of her apparent space sickness. Unbeknownst to them, however, she was actually suffering from the early effects of temporal psychosis. (VOY: "Relativity")
Ensign Lyndsay Ballard was treated by USS Voyager's EMH with inaprovaline to help reverse the effects of genetic alterations performed by the Kobali, who had re-animated her lifeless corpse in accordance with their procreation customs. The injections proved to be ineffective in combating the pathogen responsible for her alteration. Changes from inaprovaline only affected Ensign Ballard's appearance, but not her genetic or physiological makeup. {VOY: "Ashes to Ashes")