- - Four times a day, in an Rx: Abbr.
- - Every six hours, in an Rx
- - Four times daily, in an Rx
- - Four times a day, in an Rx
- - Four times a day, on an Rx
- - Every six hours, on a prescription
- - Prescription abbr.
- - Four times a day, in prescriptions
- - Four times a day: Abbr.
- - Four times a day: Pharm.
- - Rx abbr.
- - Pharmacy abbr.
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