68 yr old male has taken penicillin in the past without any problems. I gave him his first dose on the 12th,PM, 2nd dose on the 13th AM, 3rd dose PM. He had complained of stomach cramps early in the day on the 13th, and by late afternoon was feeling sick to his stomach and didn't want to eat dinner. He was given his PM dose. He complained of feeling real sick, nervous, and was up most of the nigh,t complaining of feeling nausea and by early morning had vomited twice.On the morning of the 14th I gave him his AM dose. He vomited soon afterwards, and has continued vomiting every 20-30 min until now