I found a blue oblong pill uncharted with embossment on one side reading "S4" please advise because I can not find it anywhere on any pill identifier sites.
Your pill is possibly Sandoz Sildenafil 100 mg (generic Viagra) available in Canada.
While the shape is described as rounded and diamond-shaped, the imprint code and color do match your description.
Description: Each blue, rounded, diamond-shaped film-coated tablet with one-sided embossment "S4" contains 100 mg sildenafil.
If this does not sound like your pill, please let us know and we will keep searching.
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