Half-life 5-6 hours: The half-life of caffeine is 5-6 hours, which means the amount in your blood (and therefore the effect) decreases by half in 5-6 hours. How long it works will depend not just on the half-life but also on the dose taken.
Answered 8/8/2014
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Manufacturer info:: "With different ages, sizes, and caffeine tolerance, the time that it takes for No-Doz to begin affecting you and the time No-Doz will remain in your system varies. On average, it can take 10 to 30 minutes to begin and the effect lasts for at least 3 hours and may in some cases last much longer." http://www.nodoz.com.au/faq.php
Answered 8/8/2014
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