decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.bendroflumethiazideformoterol and bendroflumethiazide both decrease serum potassium. Use Caution/Monitor.benperidolbenperidol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.benzphetamineformoterol and benzphetamine both decrease sedation. Use Caution/Monitor.formoterol and benzphetamine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.betaxololbetaxolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.betaxolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.bisoprololbisoprolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.bisoprolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.brompheniraminebrompheniramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.bumetanideformoterol and bumetanide both decrease serum potassium. Use Caution/Monitor.buprenorphine buccalbuprenorphine buccal increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.butabarbitalbutabarbital increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.butalbitalbutalbital increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.butorphanolbutorphanol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.caffeineformoterol and caffeine both decrease sedation. Use Caution/Monitor.carbenoxoloneformoterol and carbenoxolone both decrease serum potassium. Use Caution/Monitor.carbinoxaminecarbinoxamine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.carvedilolcarvedilol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.carvedilol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.celecoxibcelecoxib increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.celiprololceliprolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.celiprolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.ceritinibceritinib and formoterol both increase QTc interval. Use Caution/Monitor.chloral hydratechloral hydrate increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.chlordiazepoxidechlordiazepoxide increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.chlorothiazideformoterol and chlorothiazide both decrease serum potassium. Use Caution/Monitor.chlorpheniraminechlorpheniramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.chlorpromazinechlorpromazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.chlorthalidoneformoterol and chlorthalidone both decrease serum potassium. Use Caution/Monitor.choline magnesium trisalicylatecholine magnesium trisalicylate increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor. .cinnarizinecinnarizine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.clemastineclemastine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.clomipramineclomipramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.clonazepamclonazepam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.clorazepateclorazepate increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.clozapineclozapine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.codeinecodeine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.cyclizinecyclizine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.cyclopenthiazideformoterol and cyclopenthiazide both decrease serum potassium. Use Caution/Monitor.cyproheptadinecyproheptadine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.dasatinibdasatinib and formoterol both increase QTc interval. Modify Therapy/Monitor Closely.deflazacortformoterol and deflazacort both decrease serum potassium. Use Caution/Monitor.degarelixdegarelix and formoterol both increase QTc interval. Use Caution/Monitor.desipraminedesipramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.dexchlorpheniraminedexchlorpheniramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.dexfenfluramineformoterol and dexfenfluramine both decrease sedation. Use Caution/Monitor.formoterol and dexfenfluramine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.dexmedetomidinedexmedetomidine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.dexmethylphenidateformoterol and dexmethylphenidate both decrease sedation. Use Caution/Monitor.formoterol and dexmethylphenidate both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.dextroamphetamineformoterol and dextroamphetamine both decrease sedation. Use Caution/Monitor.formoterol and dextroamphetamine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.dextromoramidedextromoramide increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.diamorphinediamorphine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.dichlorphenamidedichlorphenamide and formoterol both decrease serum potassium. Use Caution/Monitor.dichlorphenamide, formoterol. Either increases toxicity of the other by pharmacodynamic synergism. Modify Therapy/Monitor Closely. Both drugs can cause metabolic acidosis.diclofenacdiclofenac increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.diethylpropionformoterol and diethylpropion both decrease sedation. Use Caution/Monitor.formoterol and diethylpropion both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.difenoxin hcldifenoxin hcl increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.diflunisaldiflunisal increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.digoxindigoxin increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.dimenhydrinatedimenhydrinate increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.diphenhydraminediphenhydramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.diphenoxylate hcldiphenoxylate hcl increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.dipipanonedipipanone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.dobutaminedobutamine and formoterol both decrease serum potassium. Use Caution/Monitor.dobutamine and formoterol both decrease sedation. Use Caution/Monitor.dobutamine and formoterol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.dolasetrondolasetron and formoterol both increase QTc interval. Modify Therapy/Monitor Closely.donepezildonepezil and formoterol both increase QTc interval. Use Caution/Monitor.dopamineformoterol and dopamine both decrease sedation. Use Caution/Monitor.formoterol and dopamine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.dopexaminedopexamine and formoterol both decrease serum potassium. Use Caution/Monitor.dopexamine and formoterol both decrease sedation. Use Caution/Monitor.dopexamine and formoterol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.dopexamine, formoterol. Either increases effects of the other by pharmacodynamic synergism. Use Caution/Monitor.doxepindoxepin increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.droperidoldroperidol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.drospirenonedrospirenone increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely.efavirenzefavirenz and formoterol both increase QTc interval. Use Caution/Monitor.encorafenibencorafenib and formoterol both increase QTc interval. Use Caution/Monitor.ephedrineephedrine and formoterol both decrease serum potassium. Use Caution/Monitor.ephedrine and formoterol both decrease sedation. Use Caution/Monitor.ephedrine and formoterol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.epinephrineepinephrine and formoterol both decrease serum potassium. Use Caution/Monitor.epinephrine and formoterol both decrease sedation. Use Caution/Monitor.epinephrine and formoterol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.epinephrine racemicformoterol and epinephrine racemic both decrease serum potassium. Use Caution/Monitor.formoterol and epinephrine racemic both decrease sedation. Use Caution/Monitor.formoterol and epinephrine racemic both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.eribulineribulin and formoterol both increase QTc interval. Use Caution/Monitor.escitalopramescitalopram increases toxicity of formoterol by QTc interval. Use Caution/Monitor.esmololesmolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.esmolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.estazolamestazolam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.ethacrynic acidformoterol and ethacrynic acid both decrease serum potassium. Use Caution/Monitor.ethanolethanol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.etodolacetodolac increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.fenfluramineformoterol and fenfluramine both decrease sedation. Use Caution/Monitor.formoterol and fenfluramine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.fenoprofenfenoprofen increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.fingolimodfingolimod and formoterol both increase QTc interval. Use Caution/Monitor.flecainideflecainide and formoterol both increase QTc interval. Modify Therapy/Monitor Closely.fluoxetinefluoxetine and formoterol both increase QTc interval. Modify Therapy/Monitor Closely. Fluoxetine prolongs the QT interval; the prescribing information for fluoxetine recommends avoiding concurrent use of other drugs that may prolong the QT interval; risk may be increased with higher doses and/or when associated with hypokalemia; drugs that prolong the QTc interval may potentiate the effects of beta2 agonists on the cardiovascular systemfluphenazinefluphenazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.flurazepamflurazepam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.flurbiprofenflurbiprofen increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.fluvoxaminefluvoxamine and formoterol both increase QTc interval. Modify Therapy/Monitor Closely.foscarnetformoterol and foscarnet both increase QTc interval. Modify Therapy/Monitor Closely.fostemsavirformoterol and fostemsavir both increase QTc interval. Use Caution/Monitor. QTc prolongation reported with higher than recommended doses of fostemsavir. furosemideformoterol and furosemide both decrease serum potassium. Use Caution/Monitor.gemifloxacingemifloxacin and formoterol both increase QTc interval. Use Caution/Monitor.gentamicinformoterol and gentamicin both decrease serum potassium. Use Caution/Monitor.gilteritinibgilteritinib and formoterol both increase QTc interval. Use Caution/Monitor.goserelingoserelin increases toxicity of formoterol by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.haloperidolhaloperidol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.histrelinhistrelin increases toxicity of formoterol by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.hydrochlorothiazideformoterol and hydrochlorothiazide both decrease serum potassium. Use Caution/Monitor.hydromorphonehydromorphone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.hydroxyzinehydroxyzine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.ibuprofenibuprofen increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.ibuprofen IVibuprofen IV increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.iloperidoneformoterol and iloperidone both increase QTc interval. Modify Therapy/Monitor Closely.iloperidone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.imipramineimipramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.indapamideformoterol and indapamide both decrease serum potassium. Use Caution/Monitor.indomethacinindomethacin increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.isoproterenolformoterol and isoproterenol both decrease serum potassium. Use Caution/Monitor.formoterol and isoproterenol both decrease sedation. Use Caution/Monitor.formoterol and isoproterenol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.itraconazoleitraconazole and formoterol both increase QTc interval. Use Caution/Monitor.ketoprofenketoprofen increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.ketorolacketorolac increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.ketorolac intranasalketorolac intranasal increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor. .ketotifen, ophthalmicketotifen, ophthalmic increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.labetalollabetalol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.labetalol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.lapatinibformoterol and lapatinib both increase QTc interval. Modify Therapy/Monitor Closely.lenvatinibformoterol and lenvatinib both increase QTc interval. Use Caution/Monitor. Lenvatinib prescribing information recommends monitoring ECG closely when coadministered with QT prolonging drugs.leuprolideleuprolide increases toxicity of formoterol by QTc interval. Use Caution/Monitor. Increases risk of torsades de pointes.levalbuterolformoterol and levalbuterol both decrease serum potassium. Use Caution/Monitor.formoterol and levalbuterol both decrease sedation. Use Caution/Monitor.formoterol and levalbuterol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.levofloxacinformoterol and levofloxacin both increase QTc interval. Modify Therapy/Monitor Closely.levorphanollevorphanol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.lisdexamfetamineformoterol and lisdexamfetamine both decrease sedation. Use Caution/Monitor.formoterol and lisdexamfetamine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.lofepraminelofepramine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.lofexidinelofexidine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.loprazolamloprazolam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.lorazepamlorazepam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.lormetazepamlormetazepam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.lornoxicamlornoxicam increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.loxapineloxapine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.loxapine inhaledloxapine inhaled increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.maprotilinemaprotiline increases