Abbreviation for the Latin Medicinae Doctor, Doctor of Medicine.

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  • MDCT

    Multidetector computed tomography.

  • MDI

    1. Metered-dose inhaler; 2. Multiple daily injections; 3. Mental developmental index, as in “the Bayley Mental Developmental Index (MDI), which measures language, memory, and problem-solving abilities.”

  • MDR

    1. Minimal daily requirement. 2. Multidrug resistant.

  • MDS

    Myelodysplastic syndrome, or myelodysplastic syndromes.

  • Me-too drug

    A drug that is structurally very similar to already known drugs, with only minor differences. The term “me-too” carries a negative connotation. However, me-too products may create competition and drive prices down.

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