Tiger Woods credited an “unexpected reaction” to prescribed medicine for his capture on a DUI charge that landed him in a Florida prison on Monday for about four hours.

Woods, the 14-time major champion who had back surgery five weeks prior, was arrested on suspicion of DUI at around 3 a.m. Monday, and taken to Palm Beach County jail.

A crime report may be accessible on Tuesday, Jupiter Police representative Kristin Rightler said.

“I understand the severity of what I did and I take full responsibility for my actions,” Woods said in a statement Monday evening. “I want the public to know that alcohol was not involved. What happened was an unexpected reaction to prescribed medications. I didn’t realize the mix of medications had affected me so strongly.” Woods apologized and stated, “I expect more from myself, as well.”

“I will do everything in my power to ensure this never happens again,” he said.

Woods, whose 79 triumphs rank No. 2 on the PGA Tour‘s careers list, has not played professionally for four months. He is out for the remainder of the season while he recovers from fusion surgery performed April 20 in Texas. In a press release posted Wednesday on his site, he said the surgery had an instant impact and he hasn’t “felt this great in years.”

Woods, who police state was arrested on Military Trail,  south of Indian Creek Parkway. Woods did not state in his announcement where he had been or what he was doing at that hour. Records demonstrate that the 41-year-old was booked in at 7:18 a.m. then released at 10:50 a.m.