B2 grass pollens B3 tree pollens B5 weeds and shrub pollen bacillus calmette-guerin baclofen baloxavir marboxil balsalazide disodium balsam peru bambuterol hydrochloride baricitinib barium sulfate basiliximab beclometasone dipropionate bedaquiline fumarate bee venom belantamab mafodotin belatacept belimumab belumosudil mesilate belzutifan bempedoic acid bendamustine hydrochloride monohydrate bendroflumethiazide benperidol benralizumab benserazide hydrochloride Bent pollen (Agrostis tenuis) benzalkonium chloride benzalkonium chloride solution benzocaine benzoin sumatra benzoyl peroxide benzoyl peroxide, hydrous benzydamine hydrochloride benzyl alcohol benzyl benzoate benzyl cinnamate benzylpenicillin benzathine benzylpenicillin sodium beractant berotralstat dihydrochloride betahistine dihydrochloride betaine anhydrous betamethasone dipropionate betamethasone sodium phosphate betamethasone valerate betaxolol hydrochloride Betula pendula Roth, Betula pubescens Ehrh. (as dry extract, refined) bevacizumab bexarotene bezafibrate bezlotoxumab bicalutamide bictegravir sodium bifonazole bilastine bimatoprost bimekizumab binimetinib biotin birch pollen (Betula spp) bisacodyl bismuth oxide bismuth subcitrate potassium bismuth subgallate bismuth subnitrate bismuth subsalicylate bisoprolol fumarate bivalirudin black cohosh bleomycin sulfate blinatumomab blue flag bortezomib mannitol boronic ester bosentan monohydrate bosutinib monohydrate botulinum toxin type a brentuximab vedotin brexucabtagene autoleucel brigatinib brimonidine tartrate brinzolamide brivaracetam brodalumab brolucizumab Brome pollen (Bromus spp) bromfenac sodium sesquihydrate bromocriptine mesilate buclizine hydrochloride budesonide bulevirtide acetate bumetanide bupivacaine bupivacaine hydrochloride bupivacaine hydrochloride anhydrous buprenorphine buprenorphine hydrochloride bupropion hydrochloride burdock root liquid extract burdock root powder burosumab buserelin acetate buspirone hydrochloride busulfan