GCSE Biology B1 reision notes


Drug testing

  • New medical drugs have to be tested before they can be prescribed for patients. 
  • They are tested in a laboratory to check that they are not toxic, and later they are trialled using human volunteers
  • At this point, any potential side effects should show themselves. Most substances do not pass all the tests and trials, so drug development is expensive and takes a long time.
  • Medical drug trials are not without risk. Sometimes very severe and unexpected side-effects appear.


  • Antibiotics are drugs which are used to help kill the bacteria inside your body, without killing your own cells, with examples being things such as penicillin and streptomycin


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