Geisler shared the test results online while he was still wearing head prosthetics during what appears to be a taping.
"I tested negative, by the way. I know everyone is wondering about me. I'm fine and good. I think this is a great idea for everyone to have, just in case anyone is accused online or by the police," he said.
Geisler's self-drug test comes after radio jock Karen Bordador and boyfriend Emilio Lim were nabbed last month for their alleged involvement in selling illegal drugs.
Following the arrest, the Philippine National Police (PNP) said it obtained a list of the couple's clients, which included actors, singers, models and other celebrities.
PNP Chief Ronald dela Rosa, for his part, said some celebrities have already called him up, wanting to prove their innocence to him by having themselves tested in his presence.
At least 2,000 people have been killed under the Duterte administration's war on drugs since July.