Is there such Drug that will help you to recover from a certain illness but can be lethal if you make ONE TINY mistake?

Question: Is there such Drug that will help you to recover from a certain illness but can be lethal if you make ONE TINY mistake? For example if it is too cold or too hot?
- Keywords:
  drug,
  illness,
  lethal,
  recover
Asked by JayZ2002 to Natalie on 20 Nov 2015.
- Natalie Garrett answered on 20 Nov 2015:
  
  Most drugs need to be kept within a certain temperature range, otherwise they might undergo a chemical reaction into something else entirely. To my knowledge, I can’t think of any that would kill you if this happened, but they wouldn’t be as effective.
  
  However, there is something that many people don’t think about when they take medicine, and that is how your medicines might be affected by the food you eat. For instance, grapefruits might seem like the perfect thing to have for breakfast, right? Fresh fruit, rich in Vitamin C and fiber. However, grapefruit is known to contain something that can stop your body from breaking down certain drugs. This means that even if you take the right number of pills as prescribed by your doctor, you could accidentally overdose if you’d eaten a grapefruit on the same day.
  
  So, you need to be careful to read the fine print on the bottle!
  
  For more information, see this NHS article: http://www.nhs.uk/news/2012/11November/Pages/Prescription-pills-and-grapefruit-a-deadly-mix.aspx

JayZ2002 commented on 20 Nov 2015:

Thanks a lot, i never knew that!

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- Natalie commented on 20 Nov 2015:
  
  There are others too, like if you take the supplement St John’s Wort (which some people take because they think it improves their mood) this can make the birth control pill less effective! Always read the leaflets 🙂
  
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Question: Is there such Drug that will help you to recover from a certain illness but can be lethal if you make ONE TINY mistake? For example if it is too cold or too hot?