Amebiasis and giardiasis treatment: what to know

Both are intestinal infections caused by parasites, but they are not interchangeable diagnoses. A clinician may request stool testing and choose a prescription medicine based on the organism, symptoms, pregnancy status, age, other health conditions and medicines already being taken.

Giardiasis affects the small intestine and commonly presents with diarrhoea, bloating, cramps, nausea and greasy or unusually foul-smelling stools. Some people recover without prescription treatment, but medicine may be advised when symptoms persist, the person could spread infection, or individual health factors increase concern.

Amebiasis is caused by Entamoeba histolytica. Treatment is prescribed even when symptoms are limited because the parasite can remain in the bowel. Invasive illness may require one medicine that acts in body tissues followed by another that clears organisms remaining inside the intestine. A single shared medicine does not make the complete treatment plan identical for both infections.

Take every prescribed dose exactly as directed and contact the prescriber before stopping because of side effects. Mention pregnancy, breastfeeding, liver problems, allergies and all other medicines before treatment begins. Do not use leftover antibiotics or another person's prescription; the drug and course must match the confirmed or strongly suspected parasite.

Replace fluid lost through diarrhoea with frequent drinks; an oral rehydration solution can also replace salts. Seek tailored advice early for an infant, an older adult, a pregnant person or anyone struggling to drink. Wash hands with soap and water after using the toilet or changing nappies and before preparing food. Avoid preparing food for others while unwell, and follow the clinician's advice about returning to work, nursery or swimming.

Arrange prompt medical assessment for bloody stools, fever with worsening abdominal pain, repeated vomiting, persistent diarrhoea, symptoms after recent travel, or symptoms that return after treatment. A swollen or very tender abdomen and pain high on the right side can require urgent evaluation for invasive amebiasis or another serious cause.

Go to emergency care for fainting, confusion, severe weakness, very little urine, inability to keep fluids down, intense or rapidly worsening abdominal pain, or blood in the stool with marked illness. These signs can reflect severe dehydration, intestinal inflammation or another complication and should not wait for a routine appointment.

Ask which parasite the tests found, whether repeat stool samples are needed, what each medicine is intended to clear, and which side effects warrant a call. Also ask how to manage hydration, whether household members with symptoms need testing, how long transmission precautions should continue, and what the next step is if diarrhoea does not settle.