Can claritin-d cause you to have a rapid heart rate?

Not usually: Claritin (loratadine)-d can cause elevated BP in those who already suffer from hypertension. Claritin (loratadine) can cause arrhythmias (disorders of heart rhythm) and so can the "d" part, pseudoephedrine. If you have hypertension or heart problems, you should stay away from most decongestants, most people can use antihistamines such as plain Claritin (loratadine) safely however.

Claritin-d: The decongestant can increase blood pressure and heart rate.

Yes, any "D" drug : The "d" in claritin-d, or Mucinex (guaifenesin) - d and others, all stand for decongestant. Decongestants are medications that stimulate the adrenaline system and can cause higher blood pressure and heart rate. While not bad for short time, may cause problems if used chronically. Check with your dr. If you have high blood pressure or heart rhythm problems before using these medications.