盲目用藥表現有以下幾種：一yi是shi在zai尚shang不bu清qing楚chu病bing原yuan體ti和he病bing因yin的de情qing況kuang下xia

，盲mang目mu使shi用yong抗kang菌jun藥yao物wu。二er是shi因yin誤wu診zhen造zao成cheng用yong藥yao失shi誤wu，如ru將jiang非fei典dian型xing新xin城cheng疫yi誤wu診zhen為wei慢man性xing呼hu吸xi道dao病bing，用yong北bei裏li黴mei素su治zhi療liao

；又you如ru把ba雞ji壞huai死si性xing腸chang炎yan誤wu診zhen為wei球qiu蟲chong病bing，用yong複fu方fang磺huang胺an藥yao治zhi療liao。三san是shi雖sui已yi確que診zhen病bing原yuan體ti，但dan所suo用yong藥yao物wu與yu病bing因yin不bu對dui應ying
，如ru北bei裏li黴mei素su等deng僅jin對dui黴mei形xing體ti及ji革ge蘭lan氏shi陽yang性xing菌jun有you較jiao強qiang作zuo用yong，卻que被bei用yong來lai治zhi療liao禽qin霍huo亂luan及ji由you大da腸chang杆gan菌jun引yin起qi的de疾ji病bing。上shang述shu情qing況kuang，均jun不bu能neng取qu得de明ming顯xian的de療liao效xiao。

用量不當 在(zai)雞(ji)病(bing)防(fang)治(zhi)中(zhong)，不(bu)少(shao)飼(si)養(yang)戶(hu)給(gei)雞(ji)混(hun)飼(si)或(huo)混(hun)飲(yin)的(de)藥(yao)物(wu)用(yong)量(liang)遠(yuan)遠(yuan)超(chao)過(guo)規(gui)定(ding)用(yong)量(liang)，大(da)劑(ji)量(liang)用(yong)藥(yao)有(you)時(shi)雖(sui)可(ke)僥(jiao)幸(xing)達(da)到(dao)迅(xun)速(su)控(kong)製(zhi)病(bing)情(qing)或(huo)有(you)效(xiao)治(zhi)療(liao)的(de)目(mu)的(de)，但(dan)會(hui)造(zao)成(cheng)高(gao)效(xiao)低(di)毒(du)藥(yao)物(wu)的(de)浪(lang)費(fei)


，也(ye)會(hui)因(yin)使(shi)用(yong)毒(du)性(xing)較(jiao)大(da)的(de)藥(yao)物(wu)而(er)引(yin)起(qi)中(zhong)毒(du)。在(zai)集(ji)約(yue)化(hua)養(yang)雞(ji)業(ye)中(zhong)，治(zhi)療(liao)感(gan)染(ran)性(xing)疾(ji)病(bing)時(shi)通(tong)常(chang)一(yi)個(ge)療(liao)程(cheng)為(wei)3~5天，治療某些疾病如傳染性鼻炎、慢性呼吸道病
、念珠菌病及住白細胞原蟲病時用藥時間可適當延長。若用藥1~2天
，看到症狀緩解就停藥，很容易使病原體產生耐藥性
，使今後的藥物治療更加困難，也會使雞群隱性感染、亞臨床或非典型發病。

用法不當 一yi是shi給gei藥yao途tu徑jing不bu當dang，如ru把ba不bu溶rong於yu水shui且qie毒du性xing較jiao大da的de藥yao物wu等deng混hun飲yin給gei藥yao，使shi部bu分fen雞ji攝she藥yao量liang過guo大da而er中zhong毒du，另ling一yi部bu分fen雞ji攝she藥yao量liang不bu足zu而er達da不bu到dao應ying有you的de療liao效xiao；又you如ru新xin黴mei素su肌ji注zhu時shi毒du性xing較jiao大da，僅jin可ke內nei服fu或huo經jing呼hu吸xi道dao吸xi入ru，卻que被bei不bu少shao養yang雞ji戶hu用yong於yu肌ji注zhu而er致zhi雞ji中zhong毒du或huo死si亡wang。二er是shi用yong內nei服fu不bu易yi被bei吸xi收shou的de藥yao物wu治zhi療liao腸chang道dao以yi外wai的de感gan染ran。三san是shi將jiang在zai水shui溶rong液ye中zhong不bu穩wen定ding
、易分解的藥物混飲給藥，致使用藥無效。

長期用藥 xuduoyangjihurenweixijunxingjibingkeyongkangjunyaolaikongzhi。zhiyaogeiqinquntourukangjunyao
，biankegaozhenwuyou，ruguojitianbuyongyao
，xinlijiubutashi。yixieyangjihucongjinchujidaojichulan
，yizhibujianduandibianhuanzheshiyonggezhongkangjunyaowu。zhezhongzuofajizengjialeyangjichengben，haiyishixijunchanshengnaiyaoxing，jiadalejibingzhiliaodenandu。changqiyongyaohaihuipohuaichangdaozhengchangdepingheng，yinqizhenjunxingxiaohuadaojibing。yongyaoguoduohaihuigeiqinchanpinzaochengyanzhongdeyaowucanliu，jiweihairenmendeshentijiankang，youzaochenghuanjingwuran。