. ▁If ▁a ▁ne ph rot ic ▁synd rome ▁patient ▁experiences ▁any ▁of ▁the ▁R V T ▁sympt oms ▁( fl ank ▁or ▁back ▁pain , ▁blood ▁in ▁the ▁ur ine ▁or ▁decre ased ▁kid ney ▁function ), ▁he ▁or ▁she ▁should ▁immediately ▁see ▁a ▁doctor ▁to ▁avoid ▁further ▁comp lications . ▁ ▁The ▁main ▁side ▁effect ▁of ▁ant ico ag ul ants ▁is ▁the ▁risk ▁of ▁excess ive ▁ble eding . ▁Other ▁side ▁effects ▁include : ▁blood ▁in ▁the ▁ur ine ▁or ▁f ec es , ▁severe ▁bru ising , ▁prolong ed ▁nose ble eds ▁( last ing ▁longer ▁than ▁ 1 0 ▁minutes ), ▁ble eding ▁g um , ▁blood ▁in ▁your ▁vom it ▁or ▁c ough ing ▁up ▁blood , ▁unusual ▁head aches , ▁sudden ▁severe ▁back ▁pain , ▁difficulty ▁breath ing ▁or ▁ch est ▁pain , ▁in ▁women , ▁heavy ▁or ▁increased ▁ble eding ▁during ▁the ▁period , ▁or ▁any ▁other ▁ble eding ▁from ▁the ▁v ag ina . ▁War far in ▁can ▁cause ▁r ash es , ▁di arr he a , ▁n ause a ▁( fe eling ▁sick ) ▁or ▁vom iting , ▁and ▁hair ▁loss . ▁He par in ▁can ▁cause ▁hair ▁loss ▁( al ope cia ) ▁th rom b oc yt open ia ▁– ▁a ▁sudden ▁drop ▁in ▁the ▁number ▁of ▁plate lets ▁in ▁the ▁blood . ▁ ▁It ▁has ▁been ▁reported ▁in ▁a ▁case ▁study ▁of ▁ 2 7 ▁patients ▁with ▁ne ph rot ic ▁synd rome ▁caused ▁R V T , ▁there