Background: Herbal remedies are widely available and whilst portrayed as generally harmless, they may contain a variety of potent medications that can cause unintended and potentially serious consequences. This danger is further amplified as their use is typically inadvertently not divulged to clinicians, such as in this case. Clinical Case: A 65-year-old gentleman was referred to Endocrinology for assessment of adrenal insufficiency (AI) as a cause of his lethargy. He was found to have serum cortisol levels of 38 nmol/L and 68 nmol/L (150 – 700 nmol/L) on two separate mornings. No identified recent use of inhaled, topical, intra-articular or oral exogenous steroid therapy was noted. He had an inadequate response to Synacthen stimulation with peak serum cortisol of 150 pmol/L at 60-minutes (Adequate response – Post-Synacthen cortisol >430 pmol/L). Baseline plasma ACTH was low - 1.1 pmol/L(2.0 – 10 pmol/L) and secondary (pituitary) AI was suspected. He had normal thyroid function and prolactin. The patient subsequently admitted to taking an herbal medication, “Montalin” for a few months. It was obtained over-the-counter in Indonesia for symptomatic relief of “muscle pains”. The tablet underwent analysis to investigate for presence of corticosteroid components. An intact Montalin capsule was partly dissolved and the soluble content was diluted and analysed via LCMS/MS. Presence of dexamethasone/betamethasone was confirmed at an approximate concentration of 69.8 nmol/L constituting 0.548mg and 0.81% of the tablet. At the time, betamethasone and dexamethasone could not be distinguished due to stereoisomerism, but since has been confirmed to be dexamethasone. The patient likely had suppression of the hypothalamic-pituitary-adrenal axis from unintended exogenous corticosteroid use, causing a picture of secondary AI. He requires ongoing corticosteroid replacement pending recovery of endogenous production. Although Montalin is marketed as an herbal over-the-counter medication it was confirmed to be adulterated with a potent corticosteroid. An alert issued by the Singaporean government details two further cases of adverse effects from Montalin and warns against its use. Conclusion: Herbal remedies with undisclosed potent ingredients may unknowingly cause serious adverse effects. With advances in LCMS/MS technology, laboratory analysis of either the tablets or the patient’s serum could be utilised to identify potential exogenous corticosteroid exposure.

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