Coreg Precautions and Warnings

Specific Coreg Precautions and Warnings

Warnings and precautions to be aware of prior to taking Coreg include the following:
 
  • Coreg can interact with certain medications (see Coreg Drug Interactions).
     
  • This drug may hide certain signs of hyperthyroidism. Do not stop taking Coreg suddenly, as this can cause serious symptoms. Make sure to talk with your healthcare provider before stopping the drug so that it can be done in a safe manner.
     
  • Coreg may cause extreme low blood pressure and/or a slow heart rate in some people. Symptoms can include dizziness, lightheadedness, and fainting. These symptoms may be more noticeable when going from a sitting or lying-down position to standing. If you develop any of these symptoms, contact your healthcare provider. Extreme low blood pressure is more likely to occur in people who are taking a diuretic, are on dialysis, or have diarrhea or vomiting.
 
  • Make sure not to drive, operate any heavy machinery, or perform any other tasks that require alertness before you know how Coreg affects you.
 
  • Although this medication is approved for treating heart failure, Using beta blockers such as Coreg can, in some cases, lead to heart failure or a worsening of heart failure. Contact your healthcare provider if you notice:
  
 
  • Coreg may make congestive heart failure worse. This occurs more often when the dose is increased. Therefore, if your healthcare provider prescribes this drug because he or she believes that the benefits outweigh the potential risks, your doctor may choose to monitor you more closely, especially during dosage changes. Contact your healthcare provider if you notice any symptoms of congestive heart failure.
     
  • People taking Coreg should not stop abruptly. In clinical studies, this has been shown to increase a person's chances for developing angina (chest pain), heart attack, or serious irregular heart rhythms (arrhythmias). This risk is even greater in people with existing heart disease.
     
  • Beta blockers, including Coreg, should be used with caution (if at all) in people with certain lung diseases, such as asthma, emphysema, chronic bronchitis, or chronic obstructive pulmonary disease (COPD). Beta blockers affect the lungs and can cause a narrowing of the airways. If you develop problems breathing or wheezing, call your healthcare provider.
     
  • Coreg may cause low blood sugar in some people. In some people, it may also increase blood sugar (see Coreg and Blood Sugar for more information).
     
  • In rare cases, Coreg has been known to cause a decrease in kidney function, especially in certain groups, such as those with severe congestive heart failure. Let your healthcare provider know if you experience:
 
 
  • For people with allergies, Coreg may increase the reaction to specific allergens, and your body may not respond to the usual doses of epinephrine.
     
  • This medication may worsen symptoms in people with certain conditions that affect the circulation (known medically as peripheral vascular diseases).
     
  • If you are going to have surgery, let your healthcare provider or dentist know that you are taking Coreg.

 

  • Medications like Coreg have been reported to cause intraoperative floppy iris syndrome, a problem with the eyes that can occur during cataract surgery. Stopping Coreg before surgery probably does not prevent this problem from occurring. Before having eye surgery, be sure to tell your healthcare provider if you are (or have been) on Coreg.

  

  • Coreg is a pregnancy Category C medicine, which means there may be an increased risk to the fetus. Let your healthcare provider know if you are pregnant or thinking of becoming pregnant while taking the drug (see Coreg and Pregnancy).
     
  • It is unknown if Coreg passes through breast milk. Therefore, if you are breastfeeding or plan to start, be sure to talk with your healthcare provider about this (see Coreg and Breastfeeding).
 
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