No, you should not take an extra dose of Dilzem-30 Tablet (Diltiazem) on your own for a sudden spike in blood pressure unless your doctor has specifically advised it for such situations. First, sit quietly and recheck your blood pressure after 10 to 15 minutes, as it may drop with rest. If it remains high or you develop symptoms such as chest pain, severe headache, dizziness, or breathlessness, seek urgent medical attention. Otherwise, continue your regular prescribed medicines and speak to your doctor for proper adjustment of treatment.

Taking 5 tablets of Dilzem-30 (diltiazem) at once can be dangerous, as it may lead to a slow heart rate, low blood pressure, dizziness, or even fainting. You should seek urgent medical attention or contact a doctor immediately, even if you feel fine. Do not take any more doses until advised. If you develop serious symptoms such as chest pain, severe weakness, or breathing difficulty, go to the nearest emergency department without delay.