Not likely.: This is not a side effect of doxycycline that has been reported. There is a 2% incidence of anxiety as a side effect, which can lead to insomnia. If you are not anxious then the insomnia is likely not due to the doxycycline. For side effects in detail for this drug, see http://www.drugs.com/sfx/doxycycline-side-effects.html
Answered 10/1/2015
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