"phentarine" is a newly developed medication or a substance, I recommend checking with reliable medical sources, healthcare professionals, or official drug databases for the most up-to-date and accurate information. Additionally, if it is a prescription medication, it's important to use it only under the guidance and supervision of a qualified healthcare provider.
Please note that the spelling or name might be different, and it's always crucial to ensure accurate information, especially when it comes to medications or substances. If there have been developments or new introductions in the pharmaceutical field since my last update, I might not have information on those specific details.