MRCP2-2824
A 36-year-old woman presents to a gastroenterology clinic referred by her primary care physician. She has been experiencing ongoing gastrointestinal symptoms after being diagnosed with giardiasis and receiving appropriate first-line treatment. The patient reports a 3-month history of variable bowel habits, including periods of normal motions and frequent diarrhea. She has lost approximately 7 kg in weight during the course of her illness. The patient denies experiencing fever or bloody diarrhea but reports unusual episodes of burping with an unpleasant taste, described as tasting like ‘rotten eggs’.
The patient had a stool microscopy test after her initial symptoms, which showed evidence of infection with Giardia lamblia. She had not traveled overseas recently but was employed as a nursery nurse, which was suspected to be the source of her infection. Her employer moved her to a different job role that did not involve direct contact with children after she disclosed her condition.
The patient was treated with a 5-day course of metronidazole following the diagnosis of giardiasis, which resulted in some improvement but not full resolution of her symptoms. She had no significant past medical history except for a salpingectomy performed 5 years ago due to an ectopic pregnancy. She had never experienced problematic gastrointestinal symptoms before and took no regular medications or had any known drug allergies.
Upon examination, the patient’s abdomen was unremarkable, and she appeared to be in generally good physical condition. A urinary pregnancy test was negative. The decision was made to prescribe the patient a single dose of tinidazole as a second-line treatment for giardiasis. What advice should be given to the patient alongside this treatment?