The word antiarrhythmics 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: 28
Highest Scoring Words With Friends™ Play In The Letters antiarrhythmics
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Seven Letter Word Alert: (55 words)
actants, amritas, anarchs, anarchy, animacy, animist, arctans, ariarys, artisan, artsman, ashtray, attains, catarrh, catmint, charity, chrysin, chymist, cyathia, hymnist, maniacs, mantras, marinas, martian, martini, martins, martyrs, rainhat, rattish, rhymist, rhythms, satanic, satiric, snatchy, snitchy, stamina, starchy, straint, synarch, tantric, tarmacs, tarnish, tartans, tartars, tartish, thiamin, thirsty, titanic, tramcar, transit, triarch, trinity, tsarina, tyrants, yashmac, yttrias