Is it ok to take claritin (loratadine) d that expired march of 2014?

No : I wouldn't. You never know potency of expired meds

Expired meds safe: Here is an article from Harvard discussing how safe most expired medications are: http://www.health.harvard.edu/staying-healthy/drug-expiration-dates-do-they-mean-anything. Basically, research has shown that expired meds in good condition are likely fine to use . The expiration date is the date on which the responsibility for the potency of the drug shifts from the manufacturer to the consumer.