before taking antihistamine/decongestant combination medications (e. g. chlorpheniramine brompheniramine pseudoephedrine or phenylephrine) tell your doctor or pharmacist if you are allergic to any of the medications; or if you have any other allergies. also tell your doctor if you have had bad reactions to similar drugs (sympathomimetics such as ephedrine phenylephrine pseudoephedrine). this medication should not be used if you have certain medical conditions. before using this medicine consult your doctor or pharmacist if you have: uncontrolled high blood pressure severe heart disease (e. g. severe coronary artery disease angina severe heart failure) certain types of fast heart rhythm problems (e. g. atrial fibrillation/flutter paroxysmal supraventricular tachycardia-psvt) a certain slow heart rhythm problem (sinus bradycardia) a certain eye pressure problem (narrow-angle glaucoma) difficulty urinating (e. g. due to enlarged prostate) stomach/intestinal ulcer asthma attack. before using this medication tell your doctor or pharmacist your medical history especially of: diabetes controlled blood pressure heart failure blood vessel disease (e. g. peripheral vascular disease). this drug may make you dizzy or drowsy. do not drive use machinery or do any activity that requires alertness until you are sure you can perform such activities safely. avoid alcoholic beverages. before having surgery tell your doctor or dentist that you are taking this medication. caution is advised when using this drug in the elderly because they may be more sensitive to its side effects especially dizziness drowsiness urination problems and vision problems. caution is advised when using this drug in children because they may be more sensitive to unusual side effects of the drug especially excitation agitation or increased blood pressure. during pregnancy this medication should be used only when clearly needed. discuss the risks and benefits with your doctor. some ingredients in this medication pass into breast milk and may have undesirable effects on a nursing infant. consult your doctor before breast-feeding.
what should i know before i start taking cold and flu?