Blackmores Professional S.S.M.P. combines sodium sulfate and magnesium phosphate in a single tablet.Benefits Combines sodium sulfate and magnesium phosphate in a single tablet. When prescribed by a healthcare professional S.S.M.P. is generally well tolerated at the recommended dose and may be prescribed for infants, children, pregnant and lactating women, and the elderly. The easy-to-swallow tablet can be halved or crushed to facilitate low-dose prescribing for infants and children.