Antibiotics used for mastitis

Depending on local guidance, clinicians may use an antibiotic such as flucloxacillin, dicloxacillin or cefalexin. A different medicine may be needed for a severe penicillin allergy, suspected resistant bacteria, non-breastfeeding mastitis or an infection that is not improving. Only a qualified prescriber can choose a suitable drug and dose for you.

Mastitis means inflammation of breast tissue. It can begin with milk congestion and inflammation during breastfeeding, while bacterial infection may develop or be present from the start. Breast pain, a hot or reddened area, swelling, fever and flu-like feelings can occur with mastitis.

Antibiotics treat bacteria; they do not correct ineffective milk transfer or drain an abscess. A persistent, distinct swelling may need an examination and imaging to check for a collection of pus. Mastitis outside breastfeeding also needs clinical assessment because treatment depends on its cause.

Contact a clinician if breast inflammation is worsening, you feel unwell, or supportive measures are not helping. Take any prescribed antibiotic exactly as directed and finish the course unless the prescriber changes it. Report medicine allergies, pregnancy, breastfeeding, kidney or liver problems and other medicines before starting treatment.

If you are breastfeeding, continuing to feed responsively is generally possible and can help avoid excess fullness. Do not forcefully massage the breast or repeatedly pump beyond your baby’s needs, as extra stimulation can worsen swelling. Comfortable positioning and an assessment of attachment may reduce nipple damage and improve milk transfer.

Seek urgent care if you are confused, faint, short of breath, unable to keep fluids down, or rapidly becoming more unwell. Rapidly spreading redness, severe pain, a soft or fluctuant lump, or fever that persists despite treatment also needs prompt assessment for a breast abscess or spreading infection.

Arrange another review if symptoms do not begin to improve within the timeframe given by your prescriber or if they return after treatment. A clinician may reconsider the diagnosis, test milk or drainage when appropriate, change the antibiotic, or arrange imaging and drainage.

Ask whether your symptoms suggest inflammation alone, bacterial infection or an abscess. Useful follow-up questions include whether the prescribed medicine is compatible with breastfeeding, what changes should prompt reassessment, whether a sample is needed, and how feeding technique or pumping habits could be adjusted without increasing breast swelling.