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The spelling of guanfacine in this question is correct. Guanfacine is the generic name for prescription Tenex and Intuniv.
Intuniv is a brand-name for the extended release guanfacine. Guanfacine is used to lower blood pressure; however, it does not thin blood.
Guanfacine is the generic form of Intuniv. So if the same dose and form, yes.
It wouldn't show up as anything because it isn't a drug of abuse.
No