I am a microbiologist at a company that manufactures generic pharmaceutical products (derms and creams mostly). We're considered a vital business and are continuing manufacturing during our state shutdown. They even gave us an "official" letter to carry in case we're stopped on the way to or from work.
However, we're also telling people with ANY symptoms to stay home (without charging them PTO or sick leave, thankfully), and they're moving schedules and shifts around to keep the manufacturing floor as spaced out as possible. We've definitely slowed down the pace of product out the door, because it's much slower to manufacture and package product when everyone is trying to stay 6 feet apart, and people are staying home sick or watching their kids. Medication, even OTC meds, will still be made, but might be in slightly shorter supply.