app/knowledge/renal_rules.py

"""Renal adjustment rules."""

from __future__ import annotations

_RENAL_SENSITIVE = {"metformin_like", "nsaid_like"}


def is_renal_unsafe(drug: str, egfr: float | None) -> bool:
    if egfr is None:
        return False
    return drug in _RENAL_SENSITIVE and egfr < 30.0