the 4 and S are on one side of the pill and the characters are split. the 4 is on top and the S is on the bottom with a line in between them. there is nothing on the back of the pill.
I have been unable to find any information about your pill. Is it possible your pill is foreign, a natural product or dietary supplement? Is there any more detail you can add - color and shape? or have you been able to find an answer to your question elsewhere? Let me know.
Otherwise, can you please re-check the imprint or maybe your local pharmacy could assist you.
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