Wash. Rev. Code § 69.04.500
A drug or device shall be deemed to be misbranded unless its labeling bears (1) adequate directions for use; and (2) such adequate warnings against use in those pathological conditions or by children where its use may be dangerous to health, or against unsafe dosage or methods or duration of administration or application, in such manner and form, as are necessary for the protection of users: PROVIDED, That where any requirement of clause (1) of this section as applied to any drug or device, is not necessary for the protection of the public health, the director shall promulgate regulations exempting such drug or device from such requirements. Such regulations shall include the exemptions prescribed under section 502(f)(1) of the federal act, insofar as such exemptions are applicable hereunder.
RCW 69.04.500