The drug being tested in this study is called TAK-954. This study will assess the safety, tolerability, PK and PD of single ascending TAK-954 higher intravenous doses than those previously studied.~The study will enroll approximately 6 participants. Participants will be randomly assigned (By chance, like flipping a coin) to one of the three treatment sequences-which will remain undisclosed to the participant and study doctor during the study (unless there is an urgent medical need).~In each treatment sequence, each participant will receive 2 doses of active drug out of 3 dose levels (TAK-954 0.5 mg, TAK-954 1 mg, or TAK-954 2 mg) and 1 dose of Placebo. Dose escalation will be based on the available safety/tolerability data from the previous period.~This single center trial will be conducted in the United States. The overall time to participate in this study is approximately 73 days. Participants will make a final visit on Day 16 after receiving their last dose of study drug for a follow-up assessment.
The purpose of this study is to evaluate the safety, tolerability, and PK of single ascending intravenous doses of TAK-954.