They are just identifying markers for the manufacturer. They dont always have to do with dosage. My MSIR (morphine sulfate immediate release) 15mg tabs say 54 over 733 on the tab so it is just an identifying mark for the particular tab and may only mean something to the manufacturer.
- Metoprolol Information for Consumers
- Metoprolol Information for Healthcare Professionals (includes dosage details)
- Side Effects of Metoprolol (detailed)
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