How quickly can one become used to prescription drugs so they are no longer effective?

A person I know believes that one can become acclimated to prescription drugs (or even over the counter) so that they quickly become useless.
I’m looking for authoritative references to the issue of development of drug tolerance in the human body. How quickly does it happen? Are some types of drugs more likely to reach tolerance level in most humans more quickly than others? If so, which ones? Is there an average number/amount of drugs the person must take before becoming tolerant?

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3 Comments so far

  1.   d_dtap on October 13th, 2009

    Each person has a specific level of tolerance based on their age, height/weight, level of the drug, and many other circumstances. Many medications do have a certain limitation for usage before a tolerance is built up and the drug is no longer as effective as it once was.

  2.   Daniel M on October 13th, 2009

    Thats really too broad of a question to give a specific answer… but yeah the human body can build up a tolerance to certain drugs very quickly

  3.   Eric H on October 13th, 2009

    It depends on the person its called tolerance level. What your body can tolerate depends on how often you take the drug and your body type.

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