Which action or precaution is most important for before giving any type of drug for hypertension?

Question

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Drugs that lower blood pressure can make a normal pressure too low and can make a low blood pressure worse.Checking the patient's blood pressure before giving a drug ensures that the patient is not hypotensive at the time he or she receives the drug.Some drugs can change the body's electrolyte concentration so much that an irregular heart rate can occur;however,all antihypertensive drugs can lower blood pressure.

Which Action or Precaution Is Most Important for Before Giving