A woman socked a 6-year-old boy in the head in an unprovoked attack at a Brooklyn Walgreens last week — and she is still on the lam, cops said.

The boy was as walking with his mom in the drug store on Broadway near Flushing Avenue around 7 p.m. July 29 when the woman punched him in the back of the head, according to police.

The unidentified attacker then took off, according to cops.

The boy refused medical attention, police said.

Authorities are hunting a suspect in her 40s who stands about 5-foot-10 and weighs 200 pounds, cops said. She was last seen wearing a multi-colored fitted dress, multi-colored sneakers and carrying a pink purse.