A Windsor pharmacist and two friends stopped knife-wielding thief from robbing a downtown pharmacy Saturday.

Windsor police say the incident happened at approximately 3:45 p.m. That's when the pharmacist had locked his business and was preparing to be closed at 4 p.m. for the day

The pharmacist heard a knock on the door and found a man wanting to come inside. The pharmacist opened the door and walked the man to the pharmacy counter. 

That's when police say the man suddenly pulled out a knife and made a demand for Ritalin.

The suspect held the knife against the pharmacist. The pharmacist grabbed the suspect's hands and yelled for his friends for help. 

The two friends who were sitting in a waiting area rushed to help.

The three men got the knife from the suspect, called 911 and held him on the floor until police arrived.

The knife was recovered by police at the scene.

The entire incident was captured on security video.

Police arrested a 32-year-old man and charged him with robbery and failure to comply with a condition of judicial release. He was not to be in possession of weapon.