LONDON, England (CNN) -- It is a common scenario: you are on medication but you forget to take it -- or worse, you cannot remember whether you took the pill you were due to take an hour ago.

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Official conversations about medication in racing are a fairly common occurrence these days, many of them centering on the raceday use of furosemide, also known as Lasix or Salix, a diuretic that has been proven to reduce pulmonary bleeding in racehorses, bleeding that is often the result of strenuous exercise.

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The first patient in the study, a 46-year-old woman, took a common cold remedy for two days on top of her medication for migraine, depression and asthma.

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For the past few years, a significant number of ophthalmologists have used the Avastin cancer medication to treat age-related macular generation, a common afflication among the elderly, even though the drug was never approved for this use.

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In endocrinology, a specialty focused on hormonal disorders, debates are common about what constitutes too little or too much of any hormone, and when medication is required to boost or lower levels.

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The most common discrepancy, in 55%, was missing information about the last date and time a medication was taken.

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