John Has Been Prescribed Clonidine, a Centrally Acting Adrenergic Blocker

John has been prescribed clonidine, a centrally acting adrenergic blocker, for his hypertension. He should:

A) Not miss a dose or stop taking the drug because of potential rebound hypertension
B) Increase fiber in his diet to treat any diarrhea that may occur
C) Reduce fluid intake to less than 2 L per day to prevent fluid retention
D) Avoid sitting for long periods, as this can lead to deep vein thrombosis