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It is an antibiotic. Assuming you took 1 or 2, it won't kill you.
The expression "I took it with a grain of salt" meant "I didn't believe it".
It could mean that the "regular" tests you took were old. If you're still uncertain, you should see your doctor for proper diagnosis and treatment.
Mussolini
took pcp 4 day ago how long will it take for my urine to come clean