hi there
OK side effects for loratidine and ceterizine can include lethargy and drowsiness dry mouth – to be honest the side effects should stop once the drug is metabolised and excreted – so I’d say 24 hours
the shortness of breath is more concerning – and if this is linked to the drug I’d definitely steer clear of any antihistamine in the future
In terms of getting rid of side effects – ‘fraid there’s not going to be any way to make that happen any quicker
One thing to note you may actually be getting a combination of drug side effects and breakthrough hayfever symptoms
Those that have suggested steroid nasal sprays, even though not answering your question may actually be giving you good advice – alternative to antihistamine and usually no drowsiness or lethargy (not side effect free though) Need to be used regularly to work to best effect rather than just taken when you have symptoms
Just a bit worried about the SoB though – do have asthma or other breathing problem/condition – may be an exacerbation of that or if this is just happening during hayfever season you may be experiencing more severe allergic reaction – trip to the GP wouldn’t hurt
MC