This randomized, single-blind placebo controlled clinical trial will be performed on 120 patients hospitalized with peripheral venous catheters in the internal ward of Vali-Asr Hospital, Birjand. The participants will be selected by convenience sampling and then randomly allocated to Quercetin, Tannic acid, combination or vehicle controlled groups (n=30 per group).
The inclusion criteria will include having an IV catheter; age between 18 to 60 years; hospitalization in the internal ward for at least 72 hours; insensitivity to wound glue or medication; lack of skin diseases in the area of phlebitis; having at least one of the phlebitis symptoms (pain, redness, irritation). Exclusion criterion is discharge time of less than three days. Upon phlebitis onset, the peripheral catheter will be removed and posited in another place. Before the intervention, the severity of the phlebitis will be recorded based on a four-degree scale. Accordingly, those with a phlebitis severity from 1 to 3 will be randomly allocated to one of the study groups. The treatment will be carried out for 72 hours in 12-hour intervals in the area of phlebitis. The area will be checked every 12 hours for the presence of symptoms (warmth, redness, pain, or tenderness and swelling) and phlebitis intensity.