SN instructed patient / caregiver regarding medication Diltiazem. Explained that Diltiazem is a calcium channel blocker that is used in the treatment of hypertension, angina pectoris, and some types of arrhythmia. Explained that the side effects of this medication includes stuffy nose, skin rash or itching, dizziness, headache, tired feeling, nausea or warmth, itching, redness, or tingly feeling under your skin. Instructed to notify Physician if experiencing persistence or worsening of medication side effects.