Not nasalcrom (cromolyn) . Nasalcrom's structure is symmetrical around an oxygen molecule, like the 2 hydrogens that combine with oxygen to make water. Its polar nature means cells' lipid membranes can exclude it just as they do water, and therefore it generally works only on the outsides of cells. It doesn't make it to the inside of the body, let alone the inside of the brain. It's one of the safest drugs around, therefore.