They are just different salts of the same drug:codeine. Different salts can exhibit different dissolution properties but in this case one company chose the sulphate the other chose the phosphate.
However a pharmacist could answer this question more professionally, kindly do talk to him/her, take care.
- Codeine Information for Consumers
- Codeine Information for Healthcare Professionals (includes dosage details)
- Side Effects of Codeine (detailed)
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