Gastroenteritis treatment and antibiotics: what to know

Gastroenteritis can result from viruses, bacteria, parasites, contaminated food or other triggers. Antibiotics act against selected bacteria, not viruses such as Rotavirus Infection. Taking an unsuitable antibiotic can cause side effects, disturb normal gut bacteria and make it harder to interpret later symptoms. Some bacterial illnesses also need specific testing or public-health advice before treatment is chosen. The decision depends on illness severity, travel, immune health, age, stool features and examination findings.

Replace lost fluid with frequent small sips of water or oral rehydration solution. Eat small portions when able and rest. Do not use leftover or someone else’s antibiotics, and do not stop a prescribed course without speaking with the prescriber. Ask before using anti-diarrhoeal medicines if you have fever, blood in the stool or significant abdominal pain. Record the start of symptoms, temperature, stool changes, vomiting and recent food or travel exposures for your appointment.

Get prompt medical advice for blood or mucus in diarrhoea, persistent high fever, severe abdominal pain, repeated vomiting, symptoms after recent travel, or diarrhoea that is not improving. Urgent care is needed for fainting, confusion, very little urine, inability to keep fluids down or signs of Dehydration. Children, older adults, pregnant people and people with weakened immunity may need earlier review.

Ask what cause is most consistent with your symptoms, whether a stool test is useful, and whether an antibiotic would help or harm. Confirm the dose, timing, possible interactions and what to do if vomiting follows a dose. Ask how to protect household members from spread.