Short answer: Berberine inhibits CYP3A4, CYP2D6, CYP2C9 liver enzymes and the P-glycoprotein transporter, which raises the blood levels of many medicines — a specific, pharmacological mechanism worth understanding.
Why this is described in specific pharmacological terms, not vaguely
Naming these specific enzymes and transporters, rather than a general "may interact with medications" caution, reflects a genuinely more precise, checkable safety disclosure.
Why this matters for a pharmacist consultation specifically
A pharmacist can check your specific list in a couple of minutes, free of charge — these specific enzyme names are exactly what a pharmacist would cross-reference against your medications.
💊 Worth knowing: do not rely on a supplement website — including this one — to make that judgement for you.