Antibiotics for cellulitis: what patients should know

A clinician may prescribe an oral antibiotic for a milder infection or use treatment given into a vein when illness is more severe, tablets cannot be taken, or close monitoring is needed. Do not use leftover or shared antibiotics; the drug, dose, route, and course must fit the current infection.

Cellulitis is an infection of deeper skin and nearby soft tissue. It commonly presents with expanding redness, warmth, swelling, tenderness, or pain, sometimes accompanied by fever or feeling unwell. The clinician also looks for an entry point such as a crack, wound, ulcer, or fungal infection between the toes.

Treatment selection considers the body area, pace of spread, pus or an abscess, recent procedures or injuries, previous resistant infections, medicine allergies, pregnancy, kidney function, circulation, diabetes, and immune health. An abscess may need drainage because antibiotics alone may not clear a collection of pus.

Take the antibiotic exactly as prescribed and complete the instructed course unless the prescriber changes it. Ask what to do if a dose is missed and whether the medicine interacts with your other treatments. Rest the affected area, elevate a swollen limb when practical, drink fluids, and follow wound-care instructions.

Keep planned follow-up, especially if the redness is still spreading or you feel worse. Do not squeeze blisters or pus. Once the acute problem is controlled, address portals of entry such as cracked skin, athlete's foot, or poorly healing wounds to reduce another episode.

Seek urgent medical help for rapidly spreading redness or swelling, severe or escalating pain, skin turning dusky or blistering, confusion, faintness, breathing difficulty, marked drowsiness, or fever with shaking chills. Infection around an eye, severe facial swelling, or a painful swollen joint also needs urgent assessment. These warning signs, rather than how commonly they occur, determine urgency.

Contact the prescriber promptly for vomiting that prevents doses, a new widespread rash, facial or tongue swelling, wheezing, severe diarrhoea, or no clear improvement after the expected review interval. Breathing trouble or facial swelling after a medicine is an emergency.

Ask what infection the antibiotic is intended to cover, when improvement should become noticeable, which side effects need action, and when you should return for reassessment. Clarify whether there is an abscess, wound, foot infection, swelling disorder, or circulation problem needing separate treatment.