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A member asked:
What might cause severe lower back pain and stomach ache after taking dayquil?
A doctor has provided 1 answer
Vasoconstriction: Dayquil have dextromethorphan which cause stomack upset and phenylephrine which constrict blood vessels and cause high blood pressure--stop using the medicine till this side effects resolve--if persistent get yourself checked.
Answered 5/21/2016
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