Phentermine tablet splitting eligibility
Phentermine tablets should not be cut in half unless the specific product is approved for splitting or the prescribing label instructs dose-splitting. [1]
FDA guidance on tablet splitting
FDA guidance states that splitting is appropriate only when the tablet is FDA-approved to be split, which is indicated in the prescribing information and package labeling. [1] FDA guidance also states that when splitting information is not present in the labeling, FDA has not evaluated whether split halves have the same drug content and performance as the intact tablet. [1]
Phentermine product labeling cues
For phentermine tablets sold as Adipex-P 37.5 mg, the product is described as a scored tablet in labeling. [2] A score line indicates the tablet is mechanically designed to break, but FDA guidance still requires that splitting be specifically approved in labeling for dosing-equivalent splitting. [1][2]
Practical medication safety rule
Dose changes to phentermine (including taking “half” doses) should be done only when the prescriber provides a half-tablet dose instruction for the exact product being dispensed. [1][2]
Extended-release or special formulation exceptions
If phentermine is an extended-release or other nonstandard formulation, splitting may be inappropriate and labeling-specific instructions should be followed. [3][1]
Direct answer
Phentermine tablets can be divided (cut in half) only when the dispensed product’s labeling specifies that splitting is allowed or when the prescriber/pharmacist instructs half-tablet dosing for that exact product. [1]
When to clarify before cutting
Clarification is indicated when the tablet has not been explicitly labeled as split-appropriate for that product, even if a score line is present. [1][2]