TCAs may blunt the ocular hypotensive response. Possible additive or potentiating effect w/ CNS depressants (eg, alcohol, barbiturates, opiates, sedatives or anaesth). Reduced pulse & BP w/ concomitant use of antihypertensives &/or cardiac glycosides. Potential additive effect on known systemic effects of carbonic anhydrase inhibition w/ oral carbonic anhydrase inhibitor & topical brinzolamide. Inhibited metabolism of brinzolamide w/ CYP3A4 inhibitors (eg, ketoconazole, itraconazole, clotrimazole, ritonavir, troleandomycin). Use w/ caution in patients taking medicinal products affecting metabolism & uptake of circulating amines (eg, chlorpromazine, methylphenidate, reserpine, SNRIs). Use w/ caution when initiating concomitant adrenergic receptor agonists or antagonists (eg, isoprenaline, prazosin).