A Study to Learn How Different Amounts of the Study Medicine Called PF-07940369 Are Tolerated and Act in the Body in Healthy Adults.

The purpose of this study is to learn about the safety and tolerability of a study medicine called PF-07940369 when it is taken by mouth in different amounts and/or at multiples times a day by healthy adult participants. The study will also look at the pharmacokinetics of PF-07940369 (how the medicine is changed and eliminated from the body). The study is seeking participants that are: * male or female aged between 18 to 65 years * have a body mass index (BMI) of 16 to 32 kilogram per meter squared, and * are considered to be generally healthy by the study doctor. In each dose group, 10 participants will be randomly assigned to take PF-07940369 (8 participants) or placebo (2 participants). A placebo does not have any medicine in it but looks just like the medicine being studied. Participants will receive the study medication by mouth 1 to 2 times a day for 14 days while admitted to the study clinic. The study team will look for the experiences of people receiving the study medicine. This will help the team see if the study medicine is safe and if the study can go to the next dose group. An optional Japanese group may be conducted later. Participants will take part in this study for 10 weeks. During this time, the participants will stay in the study clinic for 16 days to receive the study medication. The participants will have multiple blood samples drawn during dosing for safety laboratory assessments and up to 48 hours after receiving the last dose of PF-07940369 to look at how the body processes the study medicine. After being discharged from the study clinic, the participants will have a study visit 7 to 10 days after the last dose. The study team will also call participants one time over the phone 28 to 35 days after receiving their last dose on Day 14.