These explain how often to take medication. Medically reviewed by Anju Goel, MD QID and Q6H are both medical abbreviations used on prescription medications. QID medications should be taken four ...

But now, its my money (I'm retired) so ETFs like ProShares UltraShort QQQ (NYSEARCA:QID) is very much front of mind. I own a small position in a trading account. But if QQQ goes from tipping over ...