PF-07853578

The purposes of this study are:
* To see how the new medicine (PF-07853578) under study is tolerated. And if there are any important side effects. And, how people feel after taking single increasing amount of the medicine by mouth.
* To measure the amount of study medicine in your blood after the medicine is taken by mouth.
This study is seeking for participants who:
* are females of 18 to 65 years old and are not able to give birth to a child.
* are males of 18 to 65 years old.
* have body mass index of 16 to 31 kilograms per meter squared.
* have a total body weight of more than 50 kilograms (110 pounds). Participants will be randomly selected to receive either study medicine (PF-07853578) or placebo (a pill that has no medicine in it). Participants may receive up to 4 amounts of study medicine and up to 2 amounts of placebo.