What stormy said. I would be careful about mixing O and Hydro, but two different brands shouldn't be a problem. The FDA makes sure they are molecularly indentical. I have certainly mixed different brands, when the pharmacy decides to just change generic suppliers or I went from brand name to generic, never noticed any difference.
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Attachment Parenting, the Radical Notion that Children are Human
"I wouldn't 'Ferberize' a dog!" Maggie Sugar
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