Mr Clegg's former Parliamentary aide, Jo Swinson, and now equalities minister, has said she "took action" after some women had confided in her, but she has not specified what form that action took.
The major antihistamines in pill form are now sold over the counter -- Allegra, Claritin and Zyrtec -- but they help only with sneezing, unless specified as the "decongestant" form.