Just wondering...especially to those who are done w/ their first year at USC...how detailed do we have to know the directions for the drug list? I've been working on my portion and it seems there are MANY exceptions. For example Zyrtec syrup...if you are an Adult it is 5mg or 10mg PO qd, ages 2-5 it is 2.5mg PO qd but can increase to 5mg PO qd or 2.5mg PO bid, and younger than that...it's 2.5 PO qd...BUT if you are hepatically impaired...it should only be 5mg POqd and not recommended for children under 6. Many of the drugs have change in doses under certain circumstances.