Drug Interactions between paromomycin and Yosprala

MONITOR: Chronic use of proton pump inhibitors (PPIs) may induce hypomagnesemia, and the risk may be increased during concomitant use of diuretics or other agents that can cause magnesium loss. The mechanism via which hypomagnesemia may occur during long-term PPI use is unknown, although changes in intestinal absorption of magnesium may be involved. Hypomagnesemia has been reported rarely in patients treated with PPIs for at least three months, but in most cases, after a year or more. Serious adverse events include tetany, seizures, tremor, carpopedal spasm, atrial fibrillation, supraventricular tachycardia, and abnormal QT interval; however, patients do not always exhibit these symptoms. Hypomagnesemia can also cause impaired parathyroid hormone secretion, which may lead to hypocalcemia. In approximately 25% of the cases of PPI-associated hypomagnesemia reviewed by the FDA, the condition did not resolve with magnesium supplementation alone but also required discontinuation of the PPI. Both positive dechallenge as well as positive rechallenge (i.e., resolution of hypomagnesemia with PPI cessation and recurrence with PPI resumption) were reported in some cases. After discontinuing the PPI, the median time required for magnesium levels to normalize was one week. After restarting the PPI, the median time for hypomagnesemia to recur was two weeks.

MANAGEMENT: Monitoring of serum magnesium levels is recommended prior to initiation of therapy and periodically thereafter if prolonged treatment with a proton pump inhibitor is anticipated or when combined with other agents that can cause hypomagnesemia such as diuretics, aminoglycosides, cation exchange resins, amphotericin B, cetuximab, cisplatin, cyclosporine, foscarnet, panitumumab, pentamidine, and tacrolimus. Patients should be advised to seek immediate medical attention if they develop potential signs and symptoms of hypomagnesemia such as palpitations, arrhythmia, muscle spasm, tremor, or convulsions. In children, abnormal heart rates may cause fatigue, upset stomach, dizziness, and lightheadedness. Magnesium replacement as well as discontinuation of the PPI may be required in some patients.

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Coadministration with proton pump inhibitors may decrease the oral bioavailability of aspirin and other salicylates. The interaction has been studied with omeprazole and aspirin, although data are conflicting. In one study, pretreatment with omeprazole (20 mg/day for 2 days) in 11 healthy volunteers led to a significant and progressively greater reduction in the mean serum salicylate level at 30, 60, and 90 minutes after administration of aspirin (650 mg single dose). The investigators suggest that acid suppression may reduce the lipophilic nature of aspirin, thereby adversely affecting its absorption from the gastrointestinal tract. Another study found no effect of omeprazole pretreatment (20 mg/day for 4 days) on plasma salicylate and aspirin levels, skin bleeding times, or antiplatelet effect of low-dose aspirin (125 mg single dose) in 14 healthy volunteers. However, these results do not exclude the possibility that omeprazole might interfere with the analgesic, antipyretic, or anti-inflammatory effects of aspirin, which has been demonstrated in rats.

Proton pump inhibitors may enhance the release rate of salicylates from enteric-coated formulations due to premature disruption of the coating and intragastric release of the drug secondary to an increase in gastric pH. In eight healthy volunteers, omeprazole pretreatment (20 mg/day for 4 days) did not affect the bioavailability of salicylate from uncoated aspirin tablets but significantly increased the absorption rate of salicylate from enteric-coated sodium salicylate tablets. The clinical significance of this interaction is unknown. Theoretically, it may increase the risk of gastric adverse effects associated with salicylates.

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