Side Effects

• In children, Rondec DM has the potential to cause excitability, restlessness and insomnia or difficulty sleeping, reports RxList. Nightmares and irritability are also possible side effects for kids being treated with antihistamine medications like Rondec, according to the Mayo Clinic.
  
  

Dosage

• The normal dosages of Rondec DM for kids are one teaspoon every four to six hours with a maximum of six teaspoons per day for children twelve and older, one-half teaspoon every four to six hours with a maximum of three teaspoons per day for children six to under twelve and one-fourth teaspoon every four to six hours with a maximum of one and one-half teaspoons per day for children two to under six, explains RxList. Exceeding these dosages poses a risk for serious reactions, such as seizures, coma and even death.
  
  

Drug Interactions

• Combining Rondec DM with tricyclic antidepressants, barbiturates, medications that contain alcohol and other CNS depressants like narcotic pain relievers or cough suppressants pose a risk for respiratory depression, a life-threatening condition where your brain is unable to properly control your respiration. If your child is taking Rondec DM, consult your doctor before giving him any other over-the-counter or prescription medications.
  
  

Risks

• Rondec DM poses a risk for low blood pressure, seizures and circulatory failure. Although this is most common in adults over the age of 60, it can also occur in children, warns RxList.
  
  

Considerations

• If your child has a history of high blood pressure, heart disease, asthma, hyperthyroidism, high eye pressure or diabetes, it may not be safe for her to take Rondec DM, cautions RxList.