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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.

Dr Altman and another doctor agreed

Answered 5/21/2016

5.6k views

Thank

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