METHODS OF TREATING DISEASE WITH DICHLORPHENAMIDE
Provided herein is a method of administering dichlorphenamide, or a pharmaceutically acceptable salt thereof, to a subject in need thereof, wherein the subject is also being administered an organic anion transporter-1 (OAT1) inhibitor and/or an organic anion transporter-3 (OAT3) inhibitor. The method comprises administering to the subject a therapeutically effective amount of dichlorphenamide, or a pharmaceutically acceptable salt thereof, monitoring the subject for signs and/or symptoms of toxicity associated with the dichlorphenamide, or a pharmaceutically acceptable salt thereof, and adjusting the therapeutically effective amount of dichlorphenamide, or a pharmaceutically acceptable salt thereof, when the subject is experiencing a sign and/or symptom of toxicity associated with the dichlorphenamide, or a pharmaceutically acceptable salt thereof.
1 .- 29 . (canceled)
30 . A method of treating a disease chosen from primary hyperkalemic periodic paralysis, primary hypokalemic periodic paralysis, and related variants in a subject in need thereof,
wherein the subject is exhibiting one or more signs of dichlorphenamide toxicity as a result of increase in exposure of dichlorphenamide caused by the subject being co-administered:
(i) an organic anion transporter-1 (OAT1) substrate dichlorphenamide, or a pharmaceutically acceptable salt thereof, at an initial dosage of up to 200 mg daily to treat a disease chosen from primary hyperkalemic periodic paralysis, primary hypokalemic periodic paralysis, and related variants, and
(ii) an organic anion transporter-1 (OAT1) inhibitor to treat a disease other than primary hyperkalemic periodic paralysis, primary hypokalemic periodic paralysis, and related variants, wherein the OAT1 inhibitor is chosen from furosemide, diclofenac, naproxen, bumetanide, captopril, candesartan, losartan, chlorothiazide, cimetidine, ranitidine, telmisartan, olmesartan, simvastatin, fluvastatin, cefaclor, methotrexate, cefadroxil, cefoperazone, ceftizoxime, piperacillin, tazobactam, sulbactam, zidovudine, adefovir, cidofovir, ketorolac, diflunisal, and any combination thereof,
wherein the one or more signs of dichlorphenamide toxicity is chosen from paresthesia, cognitive disorder, dysgeusia, confusional state, hypersensitivity reactions, anaphylaxis reactions, hypokalemia, metabolic acidosis, falls, amnesia, cardiac failure, condition aggravated, convulsion, fetal death, hallucination, nephrolithiasis, pancytopenia, psychotic disorder, renal tubular necrosis, stupor, syncope, and tremor,
the method comprising:
administering a reduced dose of dichlorphenamide, or a pharmaceutically acceptable salt thereof, once daily to the subject, wherein the reduced dose is less than the initial dose; and
continuing administration of the OAT1 inhibitor.
31 . A method of treating a disease chosen from primary hyperkalemic periodic paralysis, primary hypokalemic periodic paralysis, and related variants in a subject in need thereof,
wherein the subject is also in need of treatment with an organic anion transporter-1 (OAT1) inhibitor to treat a disease other than primary hyperkalemic periodic paralysis, primary hypokalemic periodic paralysis, and related variants, and
wherein the OAT1 inhibitor is chosen from furosemide, diclofenac, naproxen, bumetanide, captopril, candesartan, losartan, chlorothiazide, cimetidine, ranitidine, telmisartan, olmesartan, simvastatin, fluvastatin, cefaclor, methotrexate, cefadroxil, cefoperazone, ceftizoxime, piperacillin, tazobactam, sulbactam, zidovudine, adefovir, cidofovir, ketorolac, diflunisal, and any combination thereof,
the method comprising:
administering the OAT1 inhibitor to the subject; and
subsequently administering dichlorphenamide, or a pharmaceutically acceptable salt thereof, to the subject at a reduced dose to compensate for the expected increase in exposure resulting from co-administration of the OAT1 inhibitor and the OAT1 substrate dichlorphenamide, or a pharmaceutically acceptable salt thereof,
wherein the reduced dose is relative to what the subject would be administered if the subject was not being administered the OAT1 inhibitor.