A Massachusetts man was charged Tuesday after being accused of tricking a pregnant woman he had dated into taking abortion pills that he disguised as an iron supplement and vitamins, Watertown police announced.

Robert Kawada, 43, of Brookline, pleaded not guilty to several charges, including poisoning and battery with a dangerous weapon on a pregnant person. Authorities allege he secretly gave his ex-girlfriend pills that were intended to end her pregnancy, including misoprostol, according to the announcement.

Misoprostol is usually combined with another drug, mifepristone, to help pregnant people safely induce an abortion before the 16th week of pregnancy. It can also be used on its own to end a pregnancy.

According to a probable cause statement cited by NBC affiliate WBTS in Boston, Kawada and the woman, whose name has not been made public, met on a dating app in January and went on a few dates before they ended the relationship in March.