German to English Medical Medical (general) units/dosage

This recurs constantly in the medical reports I translate, and I've always had to send it on to the proofreaders with a flag, but it's driving me crazy, so I thought I would finally post it here. Part of the problem is that with poor quality pdfs and OCR errors, I'm never sure if the I is an upper case letter I or a lower case letter L. If the MI were all in lower case, I would take this to mean mg/mL, easy peasy. But I'm thrown off by the MI being in caps. The drug in question currently is Butylscopolamine, but the doses I'm finding online are only given in mg, and not in mg/MI. Thanks in advance for any insights.