My 9 year old granddaughter is being given "chlorphenramine maleate". Is it heart safe?

Does "chlorphenramine maleate" have a side effect of increased heartrate? I and my older children have been using it safely for many years for alergy relief and sinus problems. My grandaughter just started using it and her grandmother wants to know if increased heartrate is a side effect. I told her that a heartrate of between 90 and 120 is normal for children. The grandaughters heartrate is between 110 and 115 when congested. She is a very high strung young girl and is very emotional most of the time. She is tolerating the medicine well and is breathing better and her mucus outlet is greatly decreased as she uses it dosed correctly. Our pharmacist agrees that it is a safe drug as long as it is used as needed and when dosing if followed correctly.