The best combination drug for Irbesartan is a dihydropyridine calcium antagonist and a thiazide diuretic. Irbesartan is an angiotensin II receptor antagonist (ARB) used in the treatment of hypertension, often in combination with dihydropyridine calcium antagonists and thiazide diuretics. 1. Dihydropyridine calcium antagonist: ARB is to dilate arterial vasculature by affecting the renin-angiotensin-aldosterone system to play a role in lowering blood pressure, while nilprednisolone, nifedipine and other dihydropyridine calcium antagonists are to dilate arterial vasculature through the blockade of calcium channels in vascular smooth muscle cells to reduce blood pressure, and the two have synergistic effect on lowering blood pressure. 2. Thiazide diuretics: thiazide diuretics such as hydrochlorothiazide, can effectively reduce blood volume and play a role in lowering blood pressure, salt-sensitive hypertension is particularly suitable, while the drug has sodium excretion and potassium excretion, and ARB in lowering blood pressure at the same time there is a role in preserving potassium, the contract between the two to improve the role of lowering blood pressure, and reduce each other’s adverse effects. Possible adverse reactions after taking Irbesartan include dizziness, tachycardia, nausea, vomiting, fatigue, etc. Irbesartan is contraindicated for those who are allergic to the drug components, pregnant from 4 to 9 months, and breastfeeding, in addition, it is not recommended that Irbesartan be used in combination with angiotensin-converting enzyme inhibitors. Treatment of high blood pressure is a long-term process, which requires the preparation of a suitable treatment plan by a doctor, and should not be taken without authorization.