651. Dopamine receptors are mainly renal, dopamine causes vasodilation by increasing c-AMP.
652. Tyrosine is the precursor for dopamine, norepinephrine, and epinephrine.
653. Amiodarone blocks sodium, potassium, and calcium channels, its side effects include pulmonary fibrosis, photosensitivity, thyroid dysfunction, and eye problems.
654. Verapamil is the prototype of CCBs.
655. Magnesium could be used in arrhythmia caused by K-channel blockers.
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