Paul Johansson's firing back at his baby mama after she got a temporary restraining order against him -- now claiming she gives their child sleeping pills.
The "One Tree Hill" star filed his response to Mercedes Connor's temporary restraining order ... where she claimed he flipped when their 5-year-old son had a food allergy scare. In his docs -- filed by attorney Gary Fishbein -- Johansson says she's the terrible parent because she gave the boy sleeping pills to knock him out at night.
He also told his side of the food allergy fight -- accusing her of being neglectful during the incident. He says Connor was engrossed with her phone while the child suffered, and she only stopped when he demanded she get some medication.
We've reached out to Connor ... so far no word back. The restraining order's been lifted, but they clearly have plenty of issues left to hammer out in court.