Is it safe to take ceterizine (zyrtec) and loratadine (claritin) together?

Usually yes, but why. Taking the two together though usually does not offer much in the way of additional benefit for nasal allergies.
Yes. Dr. Shulan is right about the combination of loratidine and ceterizine for nasal symptoms. Adding a second antihistamine of the same class provides little additional benefit. On the other hand chronic urticaria sometimes requires higher doses of antihistamines. Claritin in the morning and zyrtec at night may provide better relief than either medication taken twice daily.

Related Questions

I took a generic allergy medicine at 11am this morning containing loratadine but it has not helped. Could I take a Zyrtec (cetirizine) now or should I just wait?

Generic drugs not. Sometimes generic drugs do not work They are never tested in patients just 24-36 volunteers. This one time you could try the zyrtec (cetirizine) but otherwise discuss with your physician and stick with one medication. Read more...
Yes. As long as you are aware of possible side effects of Zyrtec (cetirizine) and that these may be magnified after taking the loratidine, you might find it works faster. If otc antihistamines are not adequately controlling your allergy symptoms, or you need to use them daily to do so, then see an Allergist for an evaluation. There are treatment strategies to bring lasting relief! Read more...
Pharmacist. Since almost twelve hours have elapsed it probably will not be problematic to take the zyrtec (cetirizine) tonight even though these are once daily medications. Your pharmacist is quite qualified to answer this type of question for you. Read more...

Is loratadine less severe than zyrtec (cetirizine)?

Loratadine is weaker. When loradine (claritin) was studied the manufacturer selected the lowest dose that gave a response better than placebo but didn't have more side effects than placebo. This caused it to be a fairly weakly effective med. As it wasn't studied at higher dose i can't speak to safety of higher doses. Personally, i find zyrtec (cetirizine) to be much more effective but may be more sedating. Read more...