In a prescription, "PR" stands for "per rectum." It indicates that the medication should be administered rectally. This route is often used for medications that need to be absorbed quickly or for patients who are unable to take medications orally.
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EVERY PRESCRIPTION WRITTEN by a doctor must include, among other things, the intended route of the medicine (how to take it). PO means you take the drug orally and PR means you take the drug rectally (as in a suppository).
pr
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PR is a grading system used for proof coins
PR stands for Public Relations. If you are referring to a geographical location, it could stand for Puerto Rico.
pr in medical terms stands for "per rectum," or a drug inserted into the rectum.
that you are 100% puerto rican
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PR is used in terms of grading coins to designate that the coin is proof. For example, a perfect proof coin would be graded as PR-70. A nearly perfect proof coin might be graded PR-68 or PR-69, etc.
Anyone can be PR of many countries, PR is not citizenship. It just mean the government of the PR issuing country, grant the person the right to live and work there. So to be a PR of both Singapore and Malaysia is not impossible.