and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.marijuanamarijuana increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.meclofenamatemeclofenamate increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.mefenamic acidmefenamic acid increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.melatoninmelatonin increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.meloxicammeloxicam increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.meperidinemeperidine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.meprobamatemeprobamate increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.metaproterenolformoterol and metaproterenol both decrease serum potassium. Use Caution/Monitor.formoterol and metaproterenol both decrease sedation. Use Caution/Monitor.formoterol and metaproterenol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.methadoneformoterol and methadone both increase QTc interval. Modify Therapy/Monitor Closely.methadone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.methamphetamineformoterol and methamphetamine both decrease sedation. Use Caution/Monitor.formoterol and methamphetamine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.methyclothiazideformoterol and methyclothiazide both decrease serum potassium. Use Caution/Monitor.methylenedioxymethamphetamineformoterol and methylenedioxymethamphetamine both decrease sedation. Use Caution/Monitor.formoterol and methylenedioxymethamphetamine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.methylphenidateformoterol and methylphenidate both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.metolazoneformoterol and metolazone both decrease serum potassium. Use Caution/Monitor.metoprololmetoprolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.metoprolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.midazolammidazolam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.midodrineformoterol and midodrine both decrease sedation. Use Caution/Monitor.formoterol and midodrine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.mifepristonemifepristone, formoterol. QTc interval. Modify Therapy/Monitor Closely. Use alternatives if available.mirtazapinemirtazapine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.modafinilformoterol and modafinil both decrease sedation. Use Caution/Monitor.morphinemorphine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.motherwortmotherwort increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.moxonidinemoxonidine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.nabilonenabilone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.nabumetonenabumetone increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.nadololnadolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.nadolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.nalbuphinenalbuphine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.naproxennaproxen increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.nebivololnebivolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.nebivolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.norepinephrineformoterol and norepinephrine both decrease serum potassium. Use Caution/Monitor.formoterol and norepinephrine both decrease sedation. Use Caution/Monitor.formoterol and norepinephrine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.nortriptylinenortriptyline increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.ofloxacinformoterol and ofloxacin both increase QTc interval. Modify Therapy/Monitor Closely.olanzapineolanzapine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.olodaterol inhaledformoterol and olodaterol inhaled both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor. Caution with coadministration of adrenergic drugs by any route because of additive sympathetic effectsopium tinctureopium tincture increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.osilodrostatosilodrostat and formoterol both increase QTc interval. Use Caution/Monitor.osimertinibosimertinib and formoterol both increase QTc interval. Use Caution/Monitor. Conduct periodic monitoring with ECGs and electrolytes in patients taking drugs known to prolong the QTc interval.oxaliplatinoxaliplatin will increase the level or effect of formoterol by Other (see comment). Use Caution/Monitor. Monitor for ECG changes if therapy is initiated in patients with drugs known to prolong QT interval.oxaprozinoxaprozin increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.oxazepamoxazepam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.oxycodoneoxycodone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.oxymorphoneoxymorphone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.ozanimodozanimod and formoterol both increase QTc interval. Modify Therapy/Monitor Closely. The potential additive effects on heart rate, treatment with ozanimod should generally not be initiated in patients who are concurrently treated with QT prolonging drugs with known arrhythmogenic properties.paliperidoneformoterol and paliperidone both increase QTc interval. Modify Therapy/Monitor Closely.paliperidone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.papaveretumpapaveretum increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.parecoxibparecoxib increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.paroxetineformoterol and paroxetine both increase QTc interval. Modify Therapy/Monitor Closely.pasireotideformoterol and pasireotide both increase QTc interval. Modify Therapy/Monitor Closely.pazopanibformoterol and pazopanib both increase QTc interval. Use Caution/Monitor.penbutololpenbutolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.penbutolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.pentazocinepentazocine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.pentobarbitalpentobarbital increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.perphenazineperphenazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.phendimetrazineformoterol and phendimetrazine both decrease sedation. Use Caution/Monitor.formoterol and phendimetrazine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.phenobarbitalphenobarbital increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.phenoxybenzaminephenoxybenzamine, formoterol. Mechanism: pharmacodynamic synergism. Use Caution/Monitor. Hypotension, tachycardia.phentermineformoterol and phentermine both decrease sedation. Use Caution/Monitor.formoterol and phentermine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.phenylephrineformoterol and phenylephrine both decrease sedation. Use Caution/Monitor.formoterol and phenylephrine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.phenylephrine POformoterol and phenylephrine PO both decrease sedation. Use Caution/Monitor.formoterol and phenylephrine PO both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.pholcodinepholcodine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.pimozidepimozide increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.pindololpindolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.pindolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.pirbuterolformoterol and pirbuterol both decrease serum potassium. Use Caution/Monitor.formoterol and pirbuterol both decrease sedation. Use Caution/Monitor.formoterol and pirbuterol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.piroxicampiroxicam increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.posaconazoleformoterol and posaconazole both increase QTc interval. Modify Therapy/Monitor Closely.potassium acid phosphatepotassium acid phosphate increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely.potassium chloridepotassium chloride increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely.potassium citratepotassium citrate increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely.primidoneprimidone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.procarbazineprocarbazine increases effects of formoterol by pharmacodynamic synergism. Use Caution/Monitor.prochlorperazineprochlorperazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.promethazinepromethazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.propranololpropranolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.propranolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.propylhexedrineformoterol and propylhexedrine both decrease sedation. Use Caution/Monitor.formoterol and propylhexedrine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.protriptylineprotriptyline increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.pseudoephedrineformoterol and pseudoephedrine both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.quazepamquazepam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.quetiapinequetiapine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.quinineformoterol and quinine both increase QTc interval. Use Caution/Monitor.ranolazineformoterol and ranolazine both increase QTc interval. Modify Therapy/Monitor Closely.ribociclibribociclib increases toxicity of formoterol by QTc interval. Use Caution/Monitor.risperidoneformoterol and risperidone both increase QTc interval. Modify Therapy/Monitor Closely.risperidone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.sacubitril/valsartansacubitril/valsartan increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.salicylates (non-asa)salicylates (non-asa) increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.salmeterolformoterol and salmeterol both decrease serum potassium. Use Caution/Monitor.formoterol and salmeterol both decrease sedation. Use Caution/Monitor.formoterol and salmeterol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.salsalatesalsalate increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.scullcapscullcap increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.secobarbitalsecobarbital increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.selpercatinibselpercatinib increases toxicity of formoterol by QTc interval. Use Caution/Monitor.serdexmethylphenidate/dexmethylphenidateformoterol and serdexmethylphenidate/dexmethylphenidate both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.shepherd's purseshepherd's purse increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.sodium sulfate/potassium chloride/magnesium sulfate/polyethylene glycolformoterol and sodium sulfate/potassium chloride/magnesium sulfate/polyethylene glycol both decrease serum potassium. Modify Therapy/Monitor Closely.solriamfetolformoterol and solriamfetol both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.sorafenibsorafenib and formoterol both increase QTc interval. Use Caution/Monitor.sotalolsotalol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.sotalol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.spironolactonespironolactone increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely.succinylcholinesuccinylcholine increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.sufentanilsufentanil increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.sulfamethoxazolesulfamethoxazole and formoterol both increase QTc interval. Modify Therapy/Monitor Closely.sulfasalazinesulfasalazine increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.sulindacsulindac increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.tapentadoltapentadol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.telavancinformoterol and telavancin both increase QTc interval. Modify Therapy/Monitor Closely.temazepamtemazepam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.terbutalineformoterol and terbutaline both decrease serum potassium. Use Caution/Monitor.formoterol and terbutaline both decrease sedation. Use Caution/Monitor.formoterol and terbutaline both increase sympathetic (adrenergic) effects, including increased blood pressure and heart rate. Use Caution/Monitor.thioridazinethioridazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.thiothixenethiothixene increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.timololtimolol increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.timolol decreases effects of formoterol by pharmacodynamic antagonism. Use Caution/Monitor.tolfenamic acidtolfenamic acid increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.tolmetintolmetin increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.tolvaptantolvaptan increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Use Caution/Monitor.topiramatetopiramate increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely.torsemideformoterol and torsemide both decrease serum potassium. Use Caution/Monitor.tramadoltramadol increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.trazodonetrazodone increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.triamterenetriamterene increases and formoterol decreases serum potassium. Effect of interaction is not clear, use caution. Modify Therapy/Monitor Closely.triazolamtriazolam increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.triclofostriclofos increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.trifluoperazinetrifluoperazine increases and formoterol decreases sedation. Effect of interaction is not clear, use caution. Use Caution/Monitor.trimethoprimformoterol and trimethoprim both increase QTc interval.