Patient was instructed about Taztia ( Diltiazem ), it belongs to a group of drugs called calcium channel blockers. It works by relaxing the muscles of your heart and blood vessels. It is used to treat hypertension (high blood pressure), angina (chest pain), and certain heart rhythm disorders. Possible SE/AR may include, dizziness. When you sit or lie down for a while, get up slowly to allow your body to adjust and minimize dizziness. Also may also experience bloating, heartburn, muscle cramps, headache, flushing, nasal congestion, sore throat, constipation or diarrhea. Inform your doctor if they become bothersome. Notify your doctor if you develop, breathing difficulties, swelling of the hands or feet, an irregular heartbeat.