| Antiretrovirals |
| Clinical Impact: | The effect of PPIs, such as omeprazole, on antiretroviral drugs is variable. The clinical importance and the mechanisms behind these interactions are not always known.- Decreased exposure of some antiretroviral drugs (e.g., rilpivirine, atazanavir and nelfinavir) when used concomitantly with omeprazole may reduce antiviral effect and promote the development of drug resistance [see Clinical Pharmacology (12.3)].
- Increased exposure of other antiretroviral drugs (e.g., saquinavir) when used concomitantly with omeprazole may increase toxicity [see Clinical Pharmacology (12.3)].
- There are other antiretroviral drugs which do not result in clinically relevant interactions with omeprazole.
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| Intervention: | Rilpivirine-containing products: Concomitant use with YOSPRALA is contraindicated [see Contraindications (4)]. Atazanavir: Avoid concomitant use with YOSPRALA. See prescribing information for atazanavir for dosing information. Nelfinavir: Avoid concomitant use with YOSPRALA. See prescribing information for nelfinavir. Saquinavir: See the prescribing information for saquinavir for monitoring of potential saquinavir-related toxicities. Other antiretrovirals: See prescribing information for specific antiretroviral drugs. |
| Heparin and Warfarin |
| Clinical Impact: | Increased INR and prothrombin time in patients receiving PPIs, including omeprazole, and warfarin concomitantly. Increases in INR and prothrombin time may lead to abnormal bleeding and even death. Aspirin can increase the anticoagulant activity of heparin and warfarin, increasing bleeding risk. |
| Intervention: | Monitor INR and prothrombin time and adjust the dose of warfarin, if needed, to maintain target INR range. Monitor and adjust the dose of heparin and warfarin as needed. |
| Methotrexate |
| Clinical Impact: | Concomitant use of omeprazole with methotrexate (primarily at high dose) may elevate and prolong serum concentrations of methotrexate and/or its metabolite hydroxymethotrexate, possibly leading to methotrexate toxicities. No formal drug interaction studies of high-dose methotrexate with PPIs, such as omeprazole, have been conducted [see Warnings and Precautions (5.17)].
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| Intervention: | A temporary withdrawal of YOSPRALA may be considered in some patients receiving high-dose methotrexate. |
| CYP2C19 Substrates (e.g., clopidogrel, citalopram, cilostazol, phenytoin, diazepam) |
| Clopidogrel |
| Clinical Impact: | Concomitant use of omeprazole 80 mg results in reduced plasma concentrations of the active metabolite of clopidogrel and a reduction in platelet inhibition [see Clinical Pharmacology (12.3)].
There are no adequate combination studies of a lower dose of omeprazole or a higher dose of clopidogrel in comparison with the approved dose of clopidogrel. |
| Intervention: | Avoid concomitant use with YOSPRALA. Consider use of alternative anti-platelet therapy [see Warnings and Precautions (5.4)].
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| Citalopram |
| Clinical Impact: | Concomitant use of omeprazole results in increased exposure of citalopram leading to an increased risk of QT prolongation [see Clinical Pharmacology (12.3)].
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| Intervention: | Limit the dose of citalopram to a maximum of 20 mg per day. See prescribing information for citalopram. |
| Cilostazol |
| Clinical Impact: | Concomitant use of omeprazole results in increased exposure of one of the active metabolites of cilostazol (3,4-dihydro-cilostazol). |
| Intervention: | Reduce the dose of cilostazol to 50 mg twice daily. See prescribing information for cilostazol. |
| Phenytoin |
| Clinical Impact: | Potential for increased exposure of phenytoin with concomitant omeprazole. Aspirin can displace protein-bound phenytoin leading to a decrease in the total concentration of phenytoin. |
| Intervention: | Monitor phenytoin serum concentrations. Dose adjustment may be needed to maintain therapeutic drug concentrations. See prescribing information for phenytoin. |
| Diazepam |
| Clinical Impact: | Increased exposure of diazepam with concomitant omeprazole [see Clinical Pharmacology (12.3)].
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| Intervention: | Monitor patients for increased sedation and reduce the dose of diazepam as needed. |
| Ticagrelor |
| Clinical Impact: | Maintenance doses of aspirin above 100 mg reduce the effectiveness of ticagrelor. |
| Intervention: | Avoid concomitant use of ticagrelor with the 325 mg/40 mg tablet strength of YOSPRALA [see Warnings and Precautions (5.5)].
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| Digoxin |
| Clinical Impact: | Potential for increased exposure of digoxin with concomitant omeprazole [see Clinical Pharmacology (12.3)].
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| Intervention: | Monitor digoxin concentrations. Dose adjustment may be needed to maintain therapeutic drug concentrations. See digoxin prescribing information. |
| Drugs Dependent on Gastric pH for Absorption (e.g., iron salts, erlotinib, dasatinib, nilotinib, mycophenolate mofetil, ketoconazole/itraconazole) |
| Clinical Impact: | Omeprazole can reduce the absorption of other drugs due to its effect on reducing intragastric acidity. |
| Intervention: | Mycophenolate mofetil (MMF): Co-administration of omeprazole in healthy subjects and in transplant patients receiving MMF has been reported to reduce the exposure to the active metabolite, mycophenolic acid (MPA), possibly due to a decrease in MMF solubility at an increased gastric pH. The clinical relevance of reduced MPA exposure on organ rejection has not been established in transplant patients receiving omeprazole and MMF. Use Yosprala with caution in transplant patients receiving MMF [see Clinical Pharmacology (12.3)].
See the prescribing information for other drugs dependent on gastric pH for absorption. |
| Tacrolimus |
| Clinical Impact: | Potential for increased exposure of tacrolimus with concomitant omeprazole, especially in transplant patients who are intermediate or poor metabolizers of CYP2C19. |
| Intervention: | Monitor tacrolimus whole blood concentrations. Dose adjustment may be needed to maintain therapeutic drug concentrations. See prescribing information for tacrolimus. |
| ACE-Inhibitors |
| Clinical Impact: | Aspirin may diminish the antihypertensive effect of ACE-inhibitors. |
| Intervention: | Monitor blood pressure as needed. |
| Beta Blockers |
| Clinical Impact: | The hypotensive effects of beta blockers may be diminished by the concomitant administration of aspirin. |
| Intervention: | Monitor blood pressure as needed in patients taking YOSPRALA concomitantly with beta blockers for hypertension. |
| Diuretics |
| Clinical Impact: | The effectiveness of diuretics in patients with underlying renal or cardiovascular disease may be diminished by the concomitant administration of aspirin. |
| Intervention: | Monitor blood pressure as needed. |
| NSAIDs |
| Clinical Impact: | The concurrent use of NSAIDs and aspirin may increase the risk of serious adverse events, including increased bleeding or decreased renal function. |
| Intervention: | Monitor for signs and symptoms of bleeding or decreased renal function. |
| Oral Hypoglycemics |
| Clinical Impact: | Moderate doses of aspirin may increase the effectiveness of oral hypoglycemic drugs, leading to hypoglycemia. |
| Intervention: | Monitor blood sugar as needed. |
| Acetazolamide |
| Clinical Impact: | Concurrent use of aspirin and acetazolamide can lead to high serum concentrations of acetazolamide (and toxicity). |
| Intervention: | Adjust the dose of acetazolamide if signs of toxicity occur. |
| Uricosuric Agents (Probenecid) |
| Clinical Impact: | Aspirin antagonizes the uricosuric action of uricosuric agents. |
| Intervention: | Monitor serum uric acid levels as needed. |
| Valproic Acid |
| Clinical Impact: | Concomitant use of aspirin can displace protein-bound valproic acid, leading to an increase in serum concentrations of valproic acid. |
| Intervention: | Monitor valproic acid serum concentrations. Dose adjustment may be needed to maintain therapeutic drug concentrations. See prescribing information for valproic acid. |
| Interactions with Investigations of Neuroendocrine Tumors |
| Clinical Impact: | Serum chromogranin A (CgA) levels increase secondary to omeprazole-induced decreases in gastric acidity. The increased CgA level may cause false positive results in diagnostic investigations for neuroendocrine tumors [see Warnings and Precautions (5.16), Clinical Pharmacology (12.2)].
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| Intervention: | Temporarily stop YOSPRALA treatment at least 14 days before assessing CgA levels and consider repeating the test if initial CgA levels are high. If serial tests are performed (e.g., for monitoring), the same commercial laboratory should be used for testing, as reference ranges between tests may vary. |
| Interaction with Secretin Stimulation Test |
| Clinical Impact: | Omeprazole can cause a hyper-response in gastrin secretion in response to secretin stimulation test, falsely suggesting gastrinoma. |
| Intervention: | Temporarily stop YOSPRALA treatment at least 14 days before assessing to allow gastrin levels to return to baseline [see Clinical Pharmacology (12.2)].
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| False Positive Urine Tests for THC |
| Clinical Impact: | There have been reports of false positive urine screening tests for tetrahydrocannabinol (THC) in patients receiving PPIs such as omeprazole. |
| Intervention: | An alternative confirmatory method should be considered to verify positive results. |
| Other |
| Clinical Impact: | There have been clinical reports of interactions with other drugs metabolized via the cytochrome P450 system (e.g., cyclosporine, disulfiram) with omeprazole. |
| Intervention: | Monitor patients to determine if it is necessary to adjust the dosage of these other drugs when taken concomitantly with YOSPRALA. |