# Pepto-bismol molar bismuth concentration

I want to measure the Bismuth molar concentration in the OTC drug "pepto bismol".

• 525 mg bismuth subsalicylate (C7H6BiO4) / 30 mL (17.5 mg/mL)
• molecular weight 363.10054 g/mol

If I convert to mM (17.5 mg/mL / 363.10054 g/mol * 1000), I get 48.2 mM. However, this value seems very high. Am I missing something obvious?

I am sorry if this question seems basic to you. I can't find the answer anywhere else though. Thank you so much in advance!

$$\require{cancel} \mathrm{\dfrac{17.5\ \cancel{mg}}{\cancel{mL}}\times \dfrac{1000\ \cancel{mL}}{L}\times \dfrac{mmol}{364.10054\ \cancel{mg}} =48.2\ mM}$$