The aim of this study was to compare the effect of nitroglycerin ointment with clobetasol ointment in the prevention of phlebitis is catheter place. This study is a clinical trial, randomized, double-blinded on145 men patients admitted to the surgical ward of Vali-asr hospital of Arak city ,that inclusion criteria (age between 20 and 60 years, patients with upper limb is health; requires 72 hours IV catheter; lack of phlebitis at the site of venipuncture, etc.) , is done. patients are divided in three group: A (clobetasol), B (NTG) and C (control). Data collection included demographic and medical questionnaire and degree of phlebitis checklist. Based on the amount of 2 grams of drugs for patients in the study group after venipuncture in the area of 2 × 4 cm distal of catheter then rubbed with gauze coated with hypoallergenic adhesive. According phlebitis symptoms include redness, warmth, pain, swelling and venous cording at 24,48 and 72 hours after venipuncture checked. If patients early discharge from hospital , acute infection or lack of full cooperation with researchers of the study, is eliminated..