Just about any pharmacy on either side should be able to help with an oral antihistamine. Benadryl or the generic equivalent would be a suggestion, although it and most antihistamines may cause drowsiness. Claritin, Zyrtec and Allegra are also ones to consider. 18 years as a pharmacy tech in another life. I have found most of the Dutch side pharmacies to be very helpful and I would expect the same on the French side. Good luck.