Round Blue Pill With M And A Square Around It 100

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For months I have been taking MSER 100mg, and the shape is oblong, color is light blue and 100 is on one side and E658 on the other side. These pills have been working great. My last refill of MSER, the pills were different. they are round, either light brown or gray, 100 on one side and either a M or a W with a square around the letter. These are not effective at all. Has my pharmacy made a mistake? Can you tell me what company manufacture's each of these pills ?and can you tell me what the different ingredients are between the two? There has to be a reason why one would work so good and one seems like a sugar pill. Thank-you very much ## The tablets with the E 658 100 marking are manufactured by Endo Pharmaceuticals Inc. and the ones with the M 100 are manufactured by Mallinckrodt...

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