Jaundice at week three of TB treatment
A 42-year-old man with newly diagnosed smear-positive pulmonary tuberculosis has been taking a fixed-dose combination of isoniazid, rifampicin, pyrazinamide, and ethambutol for 18 days. He comes to the TB clinic pharmacy with nausea, anorexia, dark urine, and yellowing of the eyes. His temperature is 37.2 °C, he has no rash, and he reports no alcohol use. He has been taking paracetamol 500 mg one or two tablets for fever and a bitter 'liver tonic' powder given by a friend. The clinic doctor is away at a training course, and the nurse asks the pharmacy technician whether to give metoclopramide and send him home until his scheduled visit in five days. The pharmacy has no laboratory service on site. The patient says he will stop all TB medicines because 'they are poisoning me.'
1. Assess the urgency and the likely cause. What should happen today, and why is giving an antiemetic and sending him home unsafe?
Read the worked answer
Urgency. Jaundice, dark urine, anorexia, and nausea in a patient on isoniazid, rifampicin, and pyrazinamide suggest drug-induced liver injury. These three drugs are hepatotoxic; ethambutol is not usually implicated. The patient needs same-day medical assessment with liver enzymes, bilirubin, INR, renal function, and viral hepatitis testing if available. Sending him home for five days with metoclopramide is unsafe: it masks vomiting and delays recognition of progressive hepatic failure. He needs a clinician who can decide whether to withhold anti-TB drugs, not a symptomatic prescription.
What to do today. Escalate to the TB program or hospital emergency department. Check vital signs, mental status, bleeding, and hydration. Ask about the exact paracetamol dose (500 mg one or two tablets - how many times daily, for how many days) and the herbal powder. Record the timeline. Do not tell him to stop all treatment permanently or to restart on his own; explain that some TB drugs can injure the liver and that the team must adjust treatment urgently. If he refuses referral, document and arrange the earliest possible review.
Why not just an antiemetic. Metoclopramide does not treat liver injury and may cause dystonia; it can falsely reassure the patient. The priority is diagnosis and supervised treatment interruption, not symptom suppression.
2. What pharmacovigilance and counseling actions are required, including what to say about his TB medicines, paracetamol, and the herbal powder?
Read the worked answer
Pharmacovigilance. Report the suspected adverse drug reaction to the national pharmacovigilance center promptly, even before causality is confirmed. Include patient age and sex, all four anti-TB drugs and doses, start dates, lot numbers if available, concomitant paracetamol and herbal product, onset date, symptoms, laboratory results, and outcome. Notify the TB program and the pharmacy manager. Do not wait for the clinician to report; the technician can initiate the form and the pharmacist can review it.
Counseling. Explain that the reaction may be drug-induced hepatitis and that stopping treatment without a plan risks TB relapse and resistance. Advise no alcohol, no paracetamol above the recommended limit, and no herbal 'liver tonics' until reviewed; unknown herbs can add liver injury. Tell him to return immediately for confusion, vomiting blood, black stools, worsening jaundice, or reduced urine. Once the team decides, explain which drugs are restarted and the follow-up plan.
Follow-up. Record the advice, referral time, and contact details. If he leaves without review, arrange a phone follow-up the same day and document that he was advised to return.