I really suspect that BFS could be caused by the fluoroquinolones family antibiotics. If you took this drug before your BFS onset, please report it, even if it's years before. They are frequently used for urinary tract infection and also for ENT infections.Here are the most frequent FQ :Second GenerationCiprofloxacin Cipro, Cipro XR, Ciprobay, CiproxinEnoxacin Enroxil, PenetrexLomefloxacin MaxaquinNadifloxacin Acuatim, Nadoxin, NadixaNorfloxacin Lexinor, Noroxin, Quinabic, JanacinOfloxacin Floxin, Oxaldin, TarividPefloxacin PeflacineRufloxacin UrofloxThird GenerationBalofloxacin BaloxinGatifloxacin Tequin, ZymarGrepafloxacin RaxarLevofloxacin Cravit, LevaquinMoxifloxacin Avelox, VigamoxPazufloxacin Pasil, PazucrossSparfloxacin ZagamTemafloxacin OmnifloxTosufloxacin Ozex, TosacinFourth GenerationBesifloxacin BesivanceClinafloxacin Gemifloxacin FactiveSitafloxacin GracevitTrovafloxacin TrovanPrulifloxacin QuisnonOn my side, I was put 3 times on this one, in the 2 years preceding my BFS onset. Before noticing twitching, I had an episode of widespread pins and needles for one full month, random widespread muscle aching, pains... I also had an episode of tennis elbow without clear reason.