Question: why can you not take grapefruit with felodipine

Reference:
Grapefruit (Are there interactions with medications?): Major Do not take this combination. Amiodarone (Cordarone) Grapefruit juice can increase how much amiodarone (Cordarone) the body absorbs. Drinking grapefruit juice while taking amiodarone (Cordarone) might increase the effects and side effects. Avoid drinking grapefruit juice if you are taking amiodarone (Cordarone). Artemether (Artenam, Paluther) The body breaks down artemether (Artenam, Paluther) to get rid of it. Grapefruit juice can decrease how quickly the body breaks down artemether (Artenam, Paluther). Drinking grapefruit juice while taking artemether (Artenam, Paluther) might increase the effects and side effects of artemether (Artenam, Paluther). Do not drink grapefruit juice if you are taking artemether (Artenam, Paluther). Atorvastatin (Lipitor) Atorvastatin (Lipitor) is a type of cholesterol lowering medication known as a "statin." The body breaks down some "statins" to get rid of them. Grapefruit juice might decrease how quickly the body breaks down "statins" including atorvastatin (Lipitor). Drinking grapefruit juice while taking atorvastatin (Lipitor) or other "statins" might increase the effects and side effects of these medications. Grapefruit might interact with some "statins" including lovastatin (Mevacor), simvastatin (Zocor), and atorvastatin (Lipitor). Grapefruit juice does not interact with other "statins" including pravastatin (Pravachol), fluvastatin (Lescol), and rosuvastatin (Crestor). Buspirone (BuSpar) Grapefruit juice might increase how much buspirone (BuSpar) the body absorbs. Drinking grapefruit juice while taking buspirone (BuSpar) might increase the effects and side effects of buspirone (BuSpar). Carbamazepine (Tegretol) Grapefruit juice might increase how much carbamazepine (Tegretol) the body absorbs. Drinking grapefruit juice while taking carbamazepine (Tegretol) might increase the effects and side effects of carbamazepine (Tegretol). Carvedilol (Coreg) The body breaks down carvedilol (Coreg) to get rid of it. Grapefruit juice seems to decrease how quickly the body breaks down carvedilol (Coreg). Drinking grapefruit juice while taking carvedilol (Coreg) might increase the effects and side effects of carvedilol (Coreg). Celiprolol (Celicard) Grapefruit appears to decrease how much celiprolol (Celicard) is absorbed. This might decrease the effectiveness of celiprolol (Celicard). Separating administration of celiprolol (Celicard) and consumption of grapefruit by at least 4 hours. Cisapride (Propulsid) Grapefruit juice might decrease how quickly the body gets rid of cisapride (Propulsid). Drinking grapefruit juice while taking cisapride (Propulsid) might increase the effects and side effects of cisapride (Propulsid). Clomipramine (Anafranil) The body breaks down clomipramine (Anafranil) to get rid of it. Grapefruit juice might decrease how quickly the body gets rid of clomipramine (Anafranil). Taking grapefruit juice along with clomipramine (Anafranil) might increase the effects and side effects of clomipramine (Anafranil). Clopidogrel (Plavix) Clopidogrel (Plavix) is a prodrug. Prodrugs need to be activated by the body to work. Grapefruit appears to decrease how much clopidogrel (Plavix) is activated by the body. This might lead to a decreased efficacy of clopidogrel. Do not take grapefruit with clopidogrel. Cyclosporine (Neoral, Sandimmune) Grapefruit might increase how much cyclosporine (Neoral, Sandimmune) the body absorbs. Drinking grapefruit juice while taking cyclosporine (Neoral, Sandimmune) might increase the side effects of cyclosporine. Dextromethorphan (Robitussin DM, and others) The body breaks down dextromethorphan (Robitussin DM, others) to get rid of it. Grapefruit might decrease how quickly the body breaks down dextromethorphan (Robitussin DM, others). Drinking grapefruit juice while taking dextromethorphan (Robitussin DM, others) might increase the effects and side effects of dextromethorphan (Robitussin DM, others). Estrogens The body breaks down estrogens to get rid of them. Grapefruit juice seems to decrease how quickly the body breaks down estrogens and increase how much estrogen the body absorbs. Drinking grapefruit juice while taking estrogens might increase estrogen levels and side effects associated with estrogen such as breast cancer. Some estrogen pills include conjugated equine estrogens (Premarin), ethinyl estradiol, estradiol (Climara, Vivelle, Estring), and others. Etoposide (VePesid) Grapefruit might decrease how much etoposide (VePesid) the body absorbs. Drinking grapefruit juice while taking etoposide (VePesid) might decrease the effectiveness of etoposide (VePesid). To avoid this interaction, separate taking this medication from consuming grapefruit by at least 4 hours. Halofantrine The body breaks down halofantrine to get rid of it. Grapefruit juice seems to decrease how quickly the body breaks down halofantrine. Drinking grapefruit juice while taking halofantrine might increase halofantrine levels and side effects associated with halofantrine, including abnormal heartbeat. Lovastatin (Mevacor) Lovastatin (Mevacor) is a type of cholesterol lowering medication known as a "statin." The body breaks down some "statins" to get rid of them. Grapefruit juice might decrease how quickly the body breaks down "statins" including lovastatin (Mevacor). Drinking grapefruit juice while taking lovastatin (Mevacor) or other "statins" might increase the effects and side effects of these medications. Grapefruit might interact with some "statins" including lovastatin (Mevacor), simvastatin (Zocor), and atorvastatin (Lipitor). Grapefruit juice does not interact with other "statins" including pravastatin (Pravachol), fluvastatin (Lescol), and rosuvastatin (Crestor). Medications changed by the liver (Cytochrome P450 3A4 (CYP3A4) substrates) Some medications are changed and broken down by the liver. Grapefruit juice might decrease how quickly the liver breaks down some medications. Drinking grapefruit juice while taking some medications that are broken down by the liver can increase the effects and side effects of some medications. Before taking grapefruit, talk to your healthcare provider if you are taking any medications that are changed by the liver. Some medications changed by the liver include lovastatin (Mevacor), ketoconazole (Nizoral), itraconazole (Sporanox), fexofenadine (Allegra), triazolam (Halcion), and many others. Medications for high blood pressure (Calcium channel blockers) Grapefruit juice might increase how much medication for high blood pressure the body absorbs. Drinking grapefruit juice while taking some medications for high blood pressure might cause your blood pressure to go too low. Some medications for high blood pressure include nifedipine (Adalat, Procardia), verapamil (Calan, Isoptin, Verelan), diltiazem (Cardizem), isradipine (DynaCirc), felodipine (Plendil), amlodipine (Norvasc), and others. Medications moved by pumps in cells (Organic anion-transporting polypeptide substrates) Some medications are moved by pumps in cells. Grapefruit might change how these pumps work and decrease how much of some medications get absorbed by the body. This could make these medications less effective. To avoid this interaction, separate taking these medications from consuming grapefruit by at least 4 hours. Some of these medications that are moved by pumps in cells include bosentan (Tracleer), celiprolol (Celicard, others), etoposide (VePesid), fexofenadine (Allegra), fluoroquinolone antibiotics, glyburide (Micronase, Diabeta), irinotecan (Camptosar), methotrexate, paclitaxel (Taxol), saquinavir (Fortovase, Invirase), rifampin, statins, talinolol, torsemide (Demadex), troglitazone, and valsartan (Diovan). Methylprednisolone The body breaks down methylprednisolone to get rid of it. Grapefruit juice can decrease how quickly the body gets rid of methylprednisolone. Drinking grapefruit juice while taking methylprednisolone might increase the effects and side effects of methylprednisolone. Pitavastatin (Pravachol) Pitavastatin (Pravachol) is a type of cholesterol lowering medication known as a "statin." The body breaks down some "statins" to get rid of them. Grapefruit juice might decrease how quickly the body breaks down "statins" including pitavastatin (Pravachol). Drinking grapefruit juice while taking pitavastatin (Pravachol) or other "statins" might increase the effects and side effects of these medications. Grapefruit might interact with some "statins" including lovastatin (Mevacor), simvastatin (Zocor), and atorvastatin (Lipitor). Grapefruit juice does not interact with other "statins" including pravastatin (Pravachol), fluvastatin (Lescol), and rosuvastatin (Crestor). Praziquantel (Biltricide) The body breaks down praziquantel (Biltricide) to get rid of it. Grapefruit juice can decrease how quickly the body breaks down praziquantel (Biltricide). Drinking grapefruit juice while taking praziquantel (Biltricide) might increase the effects and side effects of praziquantel (Biltricide). Quinidine The body breaks down quinidine to get rid of it. Grapefruit juice might decrease how fast the body gets rid of quinidine. Drinking grapefruit juice while taking quinidine might increase the chance of side effects. Scopolamine (Transderm Scop) The body breaks down scopolamine to get rid of it. Grapefruit juice can decrease how fast the body breaks down scopolamine. Drinking grapefruit juice while taking scopolamine might increase the effects and side effects of scopolamine. Sedative medications (Benzodiazepines) Sedative medications can cause sleepiness and drowsiness. Grapefruit juice can decrease how quickly the body breaks some sedative medications. Drinking grapefruit juice while taking some sedative medications can increase the effects and side effects of some sedative medications. Some sedative medications (benzodiazepines) that might interact with grapefruit juice include diazepam (Valium), midazolam (Versed), quazepam (Doral), and triazolam (Halcion). Sildenafil (Viagra) The body breaks down sildenafil (Viagra) to get rid of it. Grapefruit can decrease how quickly the body breaks down sildenafil (Viagra). Drinking grapefruit juice while taking sildenafil (Viagra) can increase the effects and side effects of sildenafil (Viagra). Simvastatin (Zocor) Simvastatin (Zocor) is a type of cholesterol lowering medication known as a "statin." The body breaks down some "statins" to get rid of them. Grapefruit juice might decrease how quickly the body breaks down "statins" including simvastatin (Zocor). Drinking grapefruit juice while taking simvastatin (Zocor) or other "statins" might increase the effects and side effects of these medications. Grapefruit might interact with some "statins" including lovastatin (Mevacor), simvastatin (Zocor), and atorvastatin (Lipitor). Grapefruit juice does not interact with other "statins" including pravastatin (Pravachol), fluvastatin (Lescol), and rosuvastatin (Crestor). Terfenadine (Seldane) Grapefruit can increase how much terfenadine (Seldane) that the body absorbs. Drinking grapefruit juice while taking terfenadine (Seldane) might increase the effects and side effects of terfenadine (Seldane). Ticagrelor (Brilinta) The body breaks down ticagrelor (Brilinta) to get rid of it. Grapefruit can decrease how quickly the body breaks down ticagrelor (Brilinta). Drinking grapefruit juice while taking ticagrelor (Brilinta) can increase the effects and side effects of ticagrelor (Brilinta). Moderate Be cautious with this combination. Aliskiren (Tekturna, Rasilez) Aliskiren (Tekturna, Rasilez) is moved by pumps in cells in the body. Grapefruit might change how these pumps work and decrease how much aliskiren (Tekturna, Rasilez) gets absorbed by the body. This could make this medication less effective. To avoid this interaction, separate taking this medication from consuming grapefruit by at least 4 hours. BUDESONIDE (Pulmicort) The body breaks down budesonide (Pulmicort) to get rid of it. Grapefruit might decease how quickly the body gets rid of budesonide (Pulmicort). Drinking grapefruit while taking budesonide (Pulmicort) might increase the side effects of budesonide (Pulmicort). Caffeine The body breaks down caffeine to get rid of it. Grapefruit might decease how quickly the body gets rid of caffeine. Drinking grapefruit while taking caffeine might increase the side effects of caffeine including jitteriness, headache, and a fast heartbeat. Colchicine The body breaks down colchicine to get rid of it. Grapefruit might decrease how quickly the body gets rid of colchicine. But some research shows that grapefruit does not decrease how quickly the body gets rid of colchicine. Until more is known, follow any instructions on the colchicine label related to intake of grapefruit. Erythromycin The body breaks down erythromycin to get rid of it. Grapefruit can decrease how quickly the body gets rid of erythromycin. Taking grapefruit juice along with erythromycin might increase the effects and side effects of erythromycin. Fexofenadine (Allegra) Grapefruit might decrease how much fexofenadine (Allegra) the body absorbs. Drinking grapefruit juice while taking fexofenadine (Allegra) might decrease the effectiveness of fexofenadine (Allegra). To avoid this interaction, separate taking this medication from consuming grapefruit by at least 4 hours. Fluvoxamine (Luvox) Grapefruit juice can increase how much fluvoxamine (Luvox) the body absorbs. Drinking grapefruit juice while taking fluvoxamine (Luvox) might increase the effects and side effects of fluvoxamine (Luvox). Itraconazole (Sporanox) Itraconazole (Sporanox) is used to treat fungal infections. Grapefruit juice might affect how much itraconazole (Sporanox) the body absorbs. But there is not enough information to know if this interaction is a major concern. Levothyroxine (Synthroid, others) Levothyroxine (Synthroid, others) is moved by pumps in cells in the body. Grapefruit might change how these pumps work and decrease how much levothyroxine (Synthroid, others) gets absorbed by the body. This could make this medication less effective. To avoid this interaction, separate taking this medication from consuming grapefruit by at least 4 hours. Losartan (Cozaar) The liver activates losartan (Cozaar) to make it work. Grapefruit juice might decrease how quickly the body activates losartan (Cozaar). Drinking grapefruit juice while taking losartan (Cozaar) might decrease the effectiveness of losartan. Medications changed by the liver (Cytochrome P450 1A2 (CYP1A2) substrates) Some medications are changed and broken down by the liver. Grapefruit juice might decrease how quickly the liver breaks down some medications. Taking grapefruit juice along with some medications that are broken down by the liver can increase the effects and side effects of some medications. Before taking grapefruit juice talk to your healthcare provider if you take any medications that are changed by the liver. Some medications that are changed by the liver include amitriptyline (Elavil), haloperidol (Haldol), ondansetron (Zofran), propranolol (Inderal), theophylline (Theo-Dur, others), verapamil (Calan, Isoptin, others), and others. Medications changed by the liver (Cytochrome P450 2C19 (CYP2C19) substrates) Some medications are changed and broken down by the liver. Grapefruit juice might decrease how quickly the liver breaks down some medications. Taking grapefruit juice along with some medications that are broken down by the liver can increase the effects and side effects of some medications. Before taking grapefruit juice talk to your healthcare provider if you take any medications that are changed by the liver. Some medications that are changed by the liver include omeprazole (Prilosec), lansoprazole (Prevacid), and pantoprazole (Protonix); diazepam (Valium); carisoprodol (Soma); nelfinavir (Viracept); and others. Medications changed by the liver (Cytochrome P450 2C9 (CYP2C9) substrates) Some medications are changed and broken down by the liver. Grapefruit juice might decrease how quickly the liver breaks down some medications. Taking grapefruit juice along with some medications that are broken down by the liver can increase the effects and side effects of some medications. Before taking grapefruit juice talk to your healthcare provider if you take any medications that are changed by the liver. Some medications that are changed by the liver include diclofenac (Cataflam, Voltaren), ibuprofen (Motrin), meloxicam (Mobic), and piroxicam (Feldene); celecoxib (Celebrex); amitriptyline (Elavil); warfarin (Coumadin); glipizide (Glucotrol); losartan (Cozaar); and others. Methadone (Dolophine) Grapefruit juice might increase how much methadone (Dolophine) the body absorbs. Drinking grapefruit juice while taking methadone (Dolophine) might increase the effects and side effects of methadone (Dolophine). Nadolol (Corgard) Nadolol (Corgard) is moved by pumps in cells in the body. Grapefruit might change how these pumps work and decrease how much nadolol (Corgard) gets absorbed by the body. This could make this medication less effective. However, some research shows that grapefruit does not affect how much nadolol (Corgard) gets absorbed by the body. Until more is known, follow any instructions on the nadolol (Corgard) label related to intake of grapefruit. Nilotinib (Tasigna) Grapefruit juice can increase how much Nilotinib (Tasigna) the body absorbs. Drinking grapefruit juice while taking Nilotinib (Tasigna) might increase the effects and side effects. Avoid drinking grapefruit juice if you are taking Nilotinib (Tasigna). Oxycodone (Oxycontin) The body breaks down oxycodone (Oxycontin) to get rid of it. Grapefruit juice can decrease how quickly the body breaks down oxycodone (Oxycontin). Drinking grapefruit juice while taking oxycodone (Oxycontin) might increase the effects and side effects of Oxycodone (Oxycontin). Primaquine Grapefruit juice can increase how much primaquine is available in the body. It is unclear what effects this might have. Be cautious with this combination. Saquinavir (Fortovase, Invirase) Drinking grapefruit juice can increase how much saquinavir (Fortovase, Invirase) the body absorbs. Drinking grapefruit juice while taking saquinavir (Fortovase, Invirase) might increase the effects and side effects of saquinavir. Sertraline The body breaks down sertraline to get rid of it. Grapefruit can decrease how quickly the body breaks down sertraline. Drinking grapefruit juice while taking sertraline can increase the effects and side effects of sertraline. Sunitinib (Sutent) The body breaks down sunitinib (Sutent) to get rid of it. Grapefruit can decrease how quickly the body breaks down sunitinib (Sutent). Drinking grapefruit juice while taking sunitinib (Sutent) can increase the effects and side effects of sunitinib (Sutent). But some research shows that the effect of grapefruit on sunitinib (Sutent) is not a big concern. Until more is known, follow any instructions on the sunitinib (Sutent) label related to intake of grapefruit. Tacrolimus Drinking grapefruit juice might increase the concentration of tacrolimus in the blood. Drinking grapefruit juice while taking tacrolimus might increase the risk for side effects. Talinolol Grapefruit juice can reduce how much talinolol is available in the body. Drinking grapefruit juice with talinolol might reduce the effects of talinolol. Theophylline Drinking grapefruit juice might decrease the effects of theophylline. There's not enough information to know if this is a big concern. Tolvaptan (Samsca) The body breaks down tolvaptan (Samsca) to get rid of it. Grapefruit can decrease how quickly the body breaks down tolvaptan (Samsca). Drinking grapefruit juice while taking tolvaptan (Samsca) can increase the effects and side effects of tolvaptan (Samsca). Warfarin (Coumadin) Warfarin (Coumadin) is used to slow blood clotting. Drinking grapefruit juice might increase the effects of warfarin (Coumadin) and increase the chances of bruising and bleeding. Be sure to have your blood checked regularly. The dose of your warfarin (Coumadin) might need to be changed. Minor Be watchful with this combination. Acebutolol (Sectral) Acebutolol (Sectral) is moved by pumps in cells in the body. Grapefruit might change how these pumps work and decrease how much acebutolol (Sectral) gets absorbed by the body. This could make this medication less effective. To avoid this interaction, separate taking this medication from consuming grapefruit by at least 4 hours. Amprenavir (Agenerase) Grapefruit might slightly decrease how much amprenavir (Agenerase) is absorbed by the body. But this interaction is probably not a major concern.

Answer: Grapefruit juice might increase how much medication for high blood pressure the body absorbs. Drinking grapefruit juice while taking some medications for high blood pressure might cause your blood pressure to go too low. Some medications for high blood pressure include nifedipine (Adalat, Procardia), verapamil (Calan, Isoptin, Verelan), diltiazem (Cardizem), isradipine (DynaCirc), felodipine (Plendil), amlodipine (Norvasc), and others.