The word antidiarrheal is playable in Words With Friends™, no blanks required. Because it is longer than 7 letters, you would have to play off an existing word or do it in several moves.
Words With Friends™ Letter Score: 18
Highest Scoring Words With Friends™ Play In The Letters antidiarrheal
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Seven Letter Word Alert: (50 words)
adrenal, airdate, airhead, airline, airraid, anilide, deliria, denarii, detrain, dilater, dirtier, drainer, enthral, hairier, hairnet, handier, handler, hardier, hernial, inditer, inertia, inhaled, inhaler, inherit, lardier, latrine, lintier, narrate, nitride, radiant, radiate, rainhat, rainier, randier, ratline, reliant, retinal, retrain, retrial, tardier, tarried, tendril, terrain, tiaraed, tradein, trailed, trailer, trained, trainer, trenail