Question: what is the difference between zyrtec r and zyrtec d?
Answer: How is ZYRTEC-D® different from ZYRTEC®? ZYRTEC-D® contains pseudoephedrine, which relieves nasal congestion. So it relieves all the same symptoms as ZYRTEC®, plus it also has a powerful decongestant. For more, see: “What symptoms does ZYRTEC® relieve?”