See an allergist to find the best option for your loved one. Read more All the medications mentioned are antihistamines.
Others available without a prescription are Zyrtec, Allegra and Xyzal.Antihistamines may oppose the effect of histamine (used to treat leukaemia) and are not recommended for people having this treatment.Antihistamines may also oppose the effect of betahistine (used to treat Ménière's disease) so loratadine is probably best avoided if you're taking betahistine.Antihistamines slow the clearance of secretions and prolong viral respiratory infections. Read more They both contain decongestants and would suggest not taking them together as you may experience side effects.If you have nasal congestion, use nasacort (triamcinolone) aq nasal spray that is now over the counter. Read more I think that it is safe but ask your pharmacist first.While short term use likely has no serious side effects, there should be a treatment that doesn't require both.Also, the reason for the symptoms should be addressed in an effort to prevent symptoms. Read more Antihistamines begin to work in less than an hour but a person may not feel significant relief for a few days.If you are taking plain zyrtec (cetirizine) (antihistamine only) you can take dayquil, but you should not take nyquil which also contains an antihistamine.Zyrtec (cetirizine) d contains a decongestant and antihistamine so it should not be mixed with other meds such as dayquil.The phenylephrine in dayquil is weaker than the Pseudoephedrine in Claritin (loratadine) d.Dayquil is for colds, and you should not take antihistamines like Claritin (loratadine) when you have a cold anyway.