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opioid agonists analgesics |
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opioid agonists antagonists, opioid antagonists |
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opioid agonists nonopioid analgesic combinations |
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osmotic diuretics |
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osmotic laxatives, stimulant laxatives |
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pancreatic enzymes |
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parathyroid hormones |
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parathyroid hormones (rDNA origin) |
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phosphate supplements |
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phosphatidylinositol-3-kinase inhibitors |
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phosphodiesterase inhibitors |
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photodynamic agents |
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piperazine derivatives |
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piperazines (peripherally selective) |
