Compounds of the general formula P1-L-P2; wherein "P1" is a pyrazinoylguanidine sodium channel blocker, "L" is a linking group, and "P2" is either (i) a pyrazinoylguanidine sodium channel blocker or (ii) a P2Y2 receptor agonist, are disclosed. Pharmaceutical formulations containing the same and methods of use thereof to hydrate mucosal surfaces such as airway mucosal surfaces are also disclosed.
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