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Drug Interactions between amiloride / hydrochlorothiazide and Teczem

This report displays the potential drug interactions for the following 2 drugs:

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Major

enalapril aMILoride

Applies to: Teczem (diltiazem / enalapril) and amiloride / hydrochlorothiazide

MONITOR CLOSELY: Concomitant use of angiotensin converting enzyme (ACE) inhibitors and potassium-sparing diuretics may increase the risk of hyperkalemia. Inhibition of ACE results in decreased aldosterone secretion, which can lead to increases in serum potassium that may be additive with that induced by potassium-sparing diuretics. The interaction may be mild in most patients with normal renal function. In a retrospective review of 127 patients treated with captopril, some of whom also received a potassium-sparing diuretic or a diuretic with a potassium supplement, no association was found between captopril use and changes in serum potassium levels. In another retrospective study, enalapril was shown to have no effect on the serum potassium of 16 patients who were taking furosemide or amiloride, and there was no difference in serum potassium levels of the group taking enalapril with diuretics compared to a similar group not taking enalapril. However, life-threatening and fatal hyperkalemia have been reported to occur within days to weeks of receiving the combination in patients with risk factors such as renal impairment, diabetes, old age, severe or worsening heart failure, and concomitant use of potassium supplements or other medications that increase serum potassium. Both ACE inhibitors alone and diuretics alone have been associated with hyperkalemia in patients with renal impairment. ACE inhibitors may also cause deterioration of renal function in patients with chronic heart failure, and the risk is increased if they are sodium-depleted or dehydrated after excessive diuresis.

MANAGEMENT: Caution is advised if ACE inhibitors are used with potassium-sparing diuretics, particularly in patients with renal impairment, diabetes, old age, worsening heart failure, and/or a risk for dehydration. Serum potassium and renal function should be checked regularly, and potassium supplementation should generally be avoided unless it is closely monitored. Patients should be given dietary counseling and advised to seek medical attention if they experience signs and symptoms of hyperkalemia such as weakness, listlessness, confusion, tingling of the extremities, and irregular heartbeat. If spironolactone is prescribed with an ACE inhibitor, some investigators recommend that its dosage not exceed 25 mg/day.

References

  1. Speirs CJ, Dollery CT, Inman WH, et al. "Postmarketing surveillance of enalapril II: investigation of the potential role of enalapril in deaths with renal failure." Br Med J 297 (1988): 830-2
  2. Burnakis TG, Mioduch HJ "Combined therapy with captopril and potassium supplementation: a potential for hyperkalemia." Arch Intern Med 144 (1984): 2371-2
  3. Murphy BF, Whitworth JA, Kincaid-Smith P "Renal insufficiency with combinations of angiotensin converting enzyme inhibitors and diuretics." Br Med J 288 (1984): 844-5
  4. Warren SE, O'Connor DT "Hyperkalemia resulting from captopril administration." JAMA 244 (1980): 2551-2
  5. Walmsley RN, White GH, Cain M, McCarthy PJ, Booth J "Hyperkalemia in the elderly." Clin Chem 30 (1984): 1409-12
  6. McNay JL, Oran E "Possible predisposition of diabetic patients to hyperkalemia following administration of potassium-retaining diuretic, amiloride (MK 870)." Metabolism 19 (1970): 58-70
  7. Johnston RT, de Bono DP, Nyman CR "Preventable sudden death in patients receiving angiotensin converting enzyme inhibitors and loop/potassium sparing diuretic combinations." Int J Cardiol 34 (1992): 213-5
  8. Radley AS, Fitzpatrick RW "An evaluation of the potential interaction between enalapril and amiloride." J Clin Pharm Ther 12 (1987): 319-23
  9. Ponce SP, Jennings AE, Madias NE, Harrington JT "Drug-induced hyperkalemia." Medicine (Baltimore) 64 (1985): 357-70
  10. Lawson DH, O'Connor PC, Jick H "Drug attributed alterations in potassium handling in congestive cardiac failure." Eur J Clin Pharmacol 23 (1982): 21-5
  11. "Product Information. K-Dur (potassium chloride)." Schering Corporation PROD (2001):
  12. Schepkens H "Life-threatening hyperkalemia during combined therapy with angiotensin-converting enzyme inhibitors and spironolactone." Am J Med 111 (2001): 587
  13. Hu Y, Carpenter JP, Cheung AT "Life-threatening hyperkalemia: a complication of spironolactone for heart failure in a patient with renal insufficiency." Anesth Analg 95 (2002): 39-41
  14. Obialo CI, Ofili EO, Mirza T "Hyperkalemia in congestive heart failure patients aged 63 to 85 years with subclinical renal disease." Am J Cardiol 90 (2002): 663-5
  15. Bozkurt B, Agoston I, Knowlton AA "Complications of inappropriate use of spironolactone in heart failure: when an old medicine spirals out of new guidelines." J Am Coll Cardiol 41 (2003): 211-4
  16. Juurlink DN, Mamdani M, Kopp A, Laupacis A, Redelmeier DA "Drug-drug interactions among elderly patients hospitalized for drug toxicity." JAMA 289 (2003): 1652-8
  17. Wrenger E, Muller R, Moesenthin M, Welte T, Frolich JC, Neumann KH "Interaction of spironolactone with ACE inhibitors or angiotensin receptor blockers: analysis of 44 cases." BMJ 327 (2003): 147-9
  18. Berry C, McMurray J "Life-threatening hyperkalemia during combined therapy with angiotensin-converting enzyme inhibitors and spironolactone." Am J Med 111 (2001): 587
  19. Chiu TF, Bullard MJ, Chen JC, Liaw SJ, Ng CJ "Rapid life-threatening hyperkalemia after addition of amiloride HCI/hydrochlorothiazide to angiotensin-converting enzyme inhibitor therapy." Ann Emerg Med 30 (1997): 612-5
  20. Atlas SA, Case DB, Sealey JE, Laragh JH, McKinstry DN "Interruption of the renin-angiotensin system in hypertensive patients by captopril induces sustained reduction in aldosterone secretion, potassium retention and natriuresis." Hypertension 1 (1979): 279-80
  21. Schepkens H, Vanholder R, Billiouw JM, Lameire N "Life-threatening hyperkalemia during combined therapy with angiotensin-converting enzyme inhibitors and spironolactone: an analysis of 25 cases." Am J Med 110 (2001): 438-41
  22. Schuna AA, Schmidt GR, Pitterle ME "Serum potassium concentrations after initiation of captopril therapy." Clin Pharm 5 (1986): 920-3
  23. Bennett WM "Drug interactions and consequences of sodium restriction." Am J Clin Nutr 65 (1997): S678-81
  24. Martin J, Mourton S, Nicholls G "Severe hyperkalaemia with prescription of potassium-retaining agents in an elderly patient." N Z Med J 116 (2003): U542
  25. Jarman PR, Mather HM "Diabetes may be independent risk factor for hyperkalaemia." BMJ 327 (2003): 812
  26. Svensson M, Gustafsson F, Galatius S, Hildebrandt PR, Atar D "Hyperkalaemia and impaired renal function in patients taking spironolactone for congestive heart failure: retrospective study." BMJ 327 (2003): 1141-2
  27. "Spironolactone + ace inhibitor or sartan: risk of hyperkalaemia." Prescrire Int 13 (2004): 58
  28. Juurlink DN, Mamdani MM, Lee DS, et al. "Rates of hyperkalemia after publication of the Randomized Aldactone Evaluation Study." N Engl J Med 351 (2004): 543-51
  29. McMurray JJ, O'Meara E "Treatment of heart failure with spironolactone--trial and tribulations." N Engl J Med 351 (2004): 526-8
  30. Tamirisa KP, Aaronson KD, Koelling TM "Spironolactone-induced renal insufficiency and hyperkalemia in patients with heart failure." Am Heart J 148 (2004): 971-8
  31. Masoudi FA, Gross CP, Wang Y, et al. "Adoption of spironolactone therapy for older patients with heart failure and left ventricular systolic dysfunction in the United States, 1998-2001." Circulation 112 (2005): 39-47
  32. Marcy TR, Ripley TL "Aldosterone antagonists in the treatment of heart failure." Am J Health Syst Pharm 63 (2006): 49-58
  33. Reardon LC, Macpherson DS "Hyperkalemia in outpatients using angiotensin-converting enzyme inhibitors. How much should we worry?" Arch Intern Med 158 (1998): 26-32
  34. Perazella MA "Drug-induced hyperkalemia: old culprits and new offenders." Am J Med 109 (2000): 307-14
  35. Cruz CS, Cruz AA, Marcilio de Souza CA "Hyperkalaemia in congestive heart failure patients using ACE inhibitors and spironolactone." Nephrol Dial Transplant 18 (2003): 1814-7
  36. Berry C, McMurray JJ "Serious adverse events experienced by patients with chronic heart failure taking spironolactone." Heart 85 (2001): E8
  37. Lakhani M "Complete heart block induced by hyperkalaemia associated with treatment with a combination of captopril and spironolactone." Br Med J (Clin Res Ed) 293 (1986): 271
  38. Jarman PR, Kehely AM, Mather HM "Hyperkalaemia in diabetes: prevalence and associations." Postgrad Med J 71 (1995): 551-2
  39. Perazella MA, Mahnensmith RL "Hyperkalemia in the elderly: drugs exacerbate impaired potassium homeostasis." J Gen Intern Med 12 (1997): 646-56
  40. Schoolwerth AC, Sica DA, Ballermann BJ, Wilcox CS, Council on the Kidney in Cardiovascular Disease and the Council for High Blood Pressure Research of the American Heart Association "Renal considerations in angiotensin converting enzyme inhibitor therapy: a statement for healthcare professionals from the Council on the Kidney in Cardiovascular Disease and the Council for High Blood Pressure Research of the American Heart Association." Circulation 104 (2001): 1985-91
  41. Large DM, Carr PH, Laing I, Davies M "Hyperkalaemia in diabetes mellitus--potential hazards of coexisting hyporeninaemic hypoaldosteronism." Postgrad Med J 60 (1984): 370-3
View all 41 references

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Moderate

enalapril hydroCHLOROthiazide

Applies to: Teczem (diltiazem / enalapril) and amiloride / hydrochlorothiazide

MONITOR: Although they are frequently combined in clinical practice, diuretics and angiotensin converting enzyme (ACE) inhibitors may have additive effects. Coadministration makes hypotension and hypovolemia more likely than does either drug alone. Some ACE inhibitors may attenuate the increase in the urinary excretion of sodium caused by some loop diuretics. Some patients on diuretics, especially those on dialysis or a dietary salt restriction, may experience acute hypotension with lightheadedness and dizziness after receiving the first dose of the ACE inhibitor. In addition, ACE inhibitors may cause renal insufficiency or acute renal failure in patients with sodium depletion or renal artery stenosis.

MANAGEMENT: Monitoring of blood pressure, diuresis, electrolytes, and renal function is recommended during coadministration. The possibility of first-dose hypotensive effects may be minimized by initiating therapy with small doses of the ACE inhibitor, or either discontinuing the diuretic temporarily or increasing the salt intake approximately one week prior to initiating an ACE inhibitor. Alternatively, the patient may remain under medical supervision for at least two hours after the first dose of the ACE inhibitor, or until blood pressure has stabilized.

References

  1. Reader C, Peyregne EA, Suarez LD "Amrinone therapy in congestive cardiomyopathy." Am Heart J 105 (1983): 1045
  2. Fujimura A, Shimokawa Y, Ebihara A "Influence of captopril on urinary excretion of furosemide in hypertensive subjects." J Clin Pharmacol 30 (1990): 538-42
  3. Funck-Brentano C, Chatellier G, Alexandre JM "Reversible renal failure after combined treatment with enalapril and furosemide in a patient with congestive heart failure." Br Heart J 55 (1986): 596-8
  4. Weisser K, Schloos J, Jakob S, et al. "The influence of hydrochlorothiazide on the pharmacokinetics of enalapril in elderly patients." Eur J Clin Pharmacol 43 (1992): 173-7
  5. Motwani JG, Fenwick MK, Morton JJ, Struthers AD "Furosemide-induced natriuresis is augmented by ultra-low-dose captopril but not by standard doses of captopril in chronic heart failure." Circulation 86 (1992): 439-45
  6. Burnakis TG, Mioduch HJ "Combined therapy with captopril and potassium supplementation: a potential for hyperkalemia." Arch Intern Med 144 (1984): 2371-2
  7. Murphy BF, Whitworth JA, Kincaid-Smith P "Renal insufficiency with combinations of angiotensin converting enzyme inhibitors and diuretics." Br Med J 288 (1984): 844-5
  8. Thind GS "Renal insufficiency during angiotensin-converting enzyme inhibitor therapy in hypertensive patients with no renal artery stenosis." J Clin Hypertens 1 (1985): 337-43
  9. Radley AS, Fitzpatrick RW "An evaluation of the potential interaction between enalapril and amiloride." J Clin Pharm Ther 12 (1987): 319-23
  10. Champ JD "Case report: azotemia secondary to enalapril and diuretic use and the diagnosis of renovascular hypertension." Am J Med Sci 305 (1993): 25-7
  11. Hume AL, Murphy JL, Lauerman SE "Angiotensin-converting enzyme inhibitor-induced cough." Pharmacotherapy 9 (1989): 88-90
  12. Lee HB, Blaufox MD "Renal functional response to captopril during diuretic therapy." J Nucl Med 33 (1992): 739-43
  13. DeQuattro V "Comparison of benazepril and other antihypertensive agents alone and in combination with the diuretic hydrochlorothiazide." Clin Cardiol 14 (1991): iv28-32;
  14. "Product Information. Vasotec (enalapril)." Merck & Co., Inc PROD (2002):
  15. McLay JS, McMurray JJ, Bridges AB, Fraser CG, Struthers AD "Acute effects of captopril on the renal actions of furosemide in patients with chronic heart failure." Am Heart J 126 (1993): 879-86
  16. Sudoh T, Fujimura A, Shiga T, et al. "Influence of lisinopril on urinary electrolytes excretion after furosemide in healthy subjects." J Clin Pharmacol 33 (1993): 640-3
  17. Lederle RM "Captopril and hydrochlorothiazide in the fixed combination multicenter trial." J Cardiovasc Pharmacol 7 (1985): S63-9
  18. "Product Information. Aceon (perindopril)." Solvay Pharmaceuticals Inc PROD (2001):
  19. Good JM, Brady AJ, Noormohamed FH, Oakley CM, Cleland JG "Effect of intense angiotensin II suppression on the diuretic response to furosemide during chronic ACE inhibition." Circulation 90 (1994): 220-4
  20. "Product Information. Capoten (captopril)." Bristol-Myers Squibb PROD (2001):
  21. "Product Information. Lexxel (enalapril-felodipine)." Astra-Zeneca Pharmaceuticals PROD (2001):
  22. "Product Information. Zestril (lisinopril)." Astra-Zeneca Pharmaceuticals PROD
  23. Cerner Multum, Inc. "Australian Product Information." O 0
View all 23 references

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Minor

enalapril dilTIAZem

Applies to: Teczem (diltiazem / enalapril) and Teczem (diltiazem / enalapril)

Calcium channel blockers and angiotensin converting enzyme (ACE) inhibitors may have additive hypotensive effects. While these drugs are often safely used together, careful monitoring of the systemic blood pressure is recommended during coadministration, especially during the first one to three weeks of therapy.

References

  1. Kaplan NM "Amlodipine in the treatment of hypertension." Postgrad Med J 67 Suppl 5 (1991): s15-9
  2. DeQuattro V "Comparison of benazepril and other antihypertensive agents alone and in combination with the diuretic hydrochlorothiazide." Clin Cardiol 14 (1991): iv28-32;
  3. Sun JX, Cipriano A, Chan K, John VA "Pharmacokinetic interaction study between benazepril and amlodipine in healthy subjects." Eur J Clin Pharmacol 47 (1994): 285-9
  4. Di Somma S, et al. "Antihypertensive effects of verapamil, captopril and their combination at rest and during dynamic exercise." Arzneimittelforschung 42 (1992): 103
View all 4 references

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Drug and food interactions

Moderate

enalapril food

Applies to: Teczem (diltiazem / enalapril)

GENERALLY AVOID: Moderate-to-high dietary intake of potassium can cause hyperkalemia in some patients who are using angiotensin converting enzyme (ACE) inhibitors. In some cases, affected patients were using a potassium-rich salt substitute. ACE inhibitors can promote hyperkalemia through inhibition of the renin-aldosterone-angiotensin (RAA) system.

MANAGEMENT: It is recommended that patients who are taking ACE inhibitors be advised to avoid moderately high or high potassium dietary intake. Particular attention should be paid to the potassium content of salt substitutes.

References

  1. "Product Information. Vasotec (enalapril)." Merck & Co., Inc PROD (2002):
  2. Good CB, McDermott L "Diet and serum potassium in patients on ACE inhibitors." JAMA 274 (1995): 538
  3. Ray K, Dorman S, Watson R "Severe hyperkalaemia due to the concomitant use of salt substitutes and ACE inhibitors in hypertension: a potentially life threatening interaction." J Hum Hypertens 13 (1999): 717-20

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Moderate

dilTIAZem food

Applies to: Teczem (diltiazem / enalapril)

MONITOR: Like many CNS-active agents, alcohol can exhibit hypotensive effects. Coadministration with antihypertensive agents including diltiazem may result in additive effects on blood pressure and orthostasis.

MONITOR: Grapefruit juice may increase the plasma concentrations of orally administered diltiazem in some patients. The proposed mechanism is inhibition of CYP450 3A4-mediated first-pass metabolism in the gut wall by certain compounds present in grapefruit. In a study of ten healthy male volunteers, administration of a single 120 mg oral dose of immediate-release diltiazem in combination with 250 mL of grapefruit juice increased the diltiazem peak plasma concentration (Cmax) and systemic exposure (AUC) by an average of 22% and 20%, respectively, compared to administration with water. The time to reach Cmax (Tmax) and the terminal half-life were not affected, and no statistically significant differences in blood pressure and heart rate were observed during administration with grapefruit juice relative to water. In a different study, repeated administration of 200 mL of grapefruit juice at 0, 2, 4, 8 and 12 hours had no significant effect on the Cmax or AUC of a single 120 mg oral dose of diltiazem, but increased its half-life from 4.1 to 5.1 hours. The ratios for the N-demethyl and deacetyl metabolites to diltiazem were also not affected by grapefruit juice. However, because pharmacokinetic interactions involving grapefruit juice are often subject to a high degree of interpatient variability, the extent to which a given patient may be affected is difficult to predict.

MANAGEMENT: Patients should be advised that alcohol may potentiate the hypotensive effects of diltiazem, especially during the initiation of therapy and following a dosage increase. Caution should be exercised when rising from a sitting or recumbent position, and patients should notify their physician if they experience dizziness, lightheadedness, syncope, orthostasis, or tachycardia. Patients who regularly consume grapefruit or grapefruit juice should be monitored for increased adverse effects of diltiazem such as such as headache, irregular heartbeat, edema, unexplained weight gain, and chest pain. Grapefruit and grapefruit juice should be avoided if an interaction is suspected.

References

  1. Bailey DG, Arnold JMO, Spence JD "Grapefruit juice and drugs - how significant is the interaction." Clin Pharmacokinet 26 (1994): 91-8
  2. Sigusch H, Henschel L, Kraul H, Merkel U, Hoffmann A "Lack of effect of grapefruit juice on diltiazem bioavailability in normal subjects." Pharmazie 49 (1994): 675-9
  3. Bailey DG, Malcolm J, Arnold O, Spence JD "Grapefruit juice-drug interactions." Br J Clin Pharmacol 46 (1998): 101-10
  4. Christensen H, Asberg A, Holmboe AB, Berg KJ "Coadministration of grapefruit juice increases systemic exposure of diltiazem in healthy volunteers." Eur J Clin Pharmacol 58 (2002): 515-520
  5. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
View all 5 references

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Moderate

enalapril food

Applies to: Teczem (diltiazem / enalapril)

MONITOR: Many psychotherapeutic and CNS-active agents (e.g., anxiolytics, sedatives, hypnotics, antidepressants, antipsychotics, opioids, alcohol, muscle relaxants) exhibit hypotensive effects, especially during initiation of therapy and dose escalation. Coadministration with antihypertensives and other hypotensive agents, in particular vasodilators and alpha-blockers, may result in additive effects on blood pressure and orthostasis.

MANAGEMENT: Caution and close monitoring for development of hypotension is advised during coadministration of these agents. Some authorities recommend avoiding alcohol in patients receiving vasodilating antihypertensive drugs. Patients should be advised to avoid rising abruptly from a sitting or recumbent position and to notify their physician if they experience dizziness, lightheadedness, syncope, orthostasis, or tachycardia.

References

  1. Sternbach H "Fluoxetine-associated potentiation of calcium-channel blockers." J Clin Psychopharmacol 11 (1991): 390-1
  2. Shook TL, Kirshenbaum JM, Hundley RF, Shorey JM, Lamas GA "Ethanol intoxication complicating intravenous nitroglycerin therapy." Ann Intern Med 101 (1984): 498-9
  3. Feder R "Bradycardia and syncope induced by fluoxetine." J Clin Psychiatry 52 (1991): 139
  4. Ellison JM, Milofsky JE, Ely E "Fluoxetine-induced bradycardia and syncope in two patients." J Clin Psychiatry 51 (1990): 385-6
  5. Rodriguez de la Torre B, Dreher J, Malevany I, et al. "Serum levels and cardiovascular effects of tricyclic antidepressants and selective serotonin reuptake inhibitors in depressed patients." Ther Drug Monit 23 (2001): 435-40
  6. Cerner Multum, Inc. "Australian Product Information." O 0
  7. Pacher P, Kecskemeti V "Cardiovascular side effects of new antidepressants and antipsychotics: new drugs, old concerns?" Curr Pharm Des 10 (2004): 2463-75
  8. Andrews C, Pinner G "Postural hypotension induced by paroxetine." BMJ 316 (1998): 595
View all 8 references

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Moderate

aMILoride food

Applies to: amiloride / hydrochlorothiazide

MONITOR: Many psychotherapeutic and CNS-active agents (e.g., anxiolytics, sedatives, hypnotics, antidepressants, antipsychotics, opioids, alcohol, muscle relaxants) exhibit hypotensive effects, especially during initiation of therapy and dose escalation. Coadministration with antihypertensives and other hypotensive agents, in particular vasodilators and alpha-blockers, may result in additive effects on blood pressure and orthostasis.

MANAGEMENT: Caution and close monitoring for development of hypotension is advised during coadministration of these agents. Some authorities recommend avoiding alcohol in patients receiving vasodilating antihypertensive drugs. Patients should be advised to avoid rising abruptly from a sitting or recumbent position and to notify their physician if they experience dizziness, lightheadedness, syncope, orthostasis, or tachycardia.

References

  1. Sternbach H "Fluoxetine-associated potentiation of calcium-channel blockers." J Clin Psychopharmacol 11 (1991): 390-1
  2. Shook TL, Kirshenbaum JM, Hundley RF, Shorey JM, Lamas GA "Ethanol intoxication complicating intravenous nitroglycerin therapy." Ann Intern Med 101 (1984): 498-9
  3. Feder R "Bradycardia and syncope induced by fluoxetine." J Clin Psychiatry 52 (1991): 139
  4. Ellison JM, Milofsky JE, Ely E "Fluoxetine-induced bradycardia and syncope in two patients." J Clin Psychiatry 51 (1990): 385-6
  5. Rodriguez de la Torre B, Dreher J, Malevany I, et al. "Serum levels and cardiovascular effects of tricyclic antidepressants and selective serotonin reuptake inhibitors in depressed patients." Ther Drug Monit 23 (2001): 435-40
  6. Cerner Multum, Inc. "Australian Product Information." O 0
  7. Pacher P, Kecskemeti V "Cardiovascular side effects of new antidepressants and antipsychotics: new drugs, old concerns?" Curr Pharm Des 10 (2004): 2463-75
  8. Andrews C, Pinner G "Postural hypotension induced by paroxetine." BMJ 316 (1998): 595
View all 8 references

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Moderate

hydroCHLOROthiazide food

Applies to: amiloride / hydrochlorothiazide

MONITOR: Many psychotherapeutic and CNS-active agents (e.g., anxiolytics, sedatives, hypnotics, antidepressants, antipsychotics, opioids, alcohol, muscle relaxants) exhibit hypotensive effects, especially during initiation of therapy and dose escalation. Coadministration with antihypertensives and other hypotensive agents, in particular vasodilators and alpha-blockers, may result in additive effects on blood pressure and orthostasis.

MANAGEMENT: Caution and close monitoring for development of hypotension is advised during coadministration of these agents. Some authorities recommend avoiding alcohol in patients receiving vasodilating antihypertensive drugs. Patients should be advised to avoid rising abruptly from a sitting or recumbent position and to notify their physician if they experience dizziness, lightheadedness, syncope, orthostasis, or tachycardia.

References

  1. Sternbach H "Fluoxetine-associated potentiation of calcium-channel blockers." J Clin Psychopharmacol 11 (1991): 390-1
  2. Shook TL, Kirshenbaum JM, Hundley RF, Shorey JM, Lamas GA "Ethanol intoxication complicating intravenous nitroglycerin therapy." Ann Intern Med 101 (1984): 498-9
  3. Feder R "Bradycardia and syncope induced by fluoxetine." J Clin Psychiatry 52 (1991): 139
  4. Ellison JM, Milofsky JE, Ely E "Fluoxetine-induced bradycardia and syncope in two patients." J Clin Psychiatry 51 (1990): 385-6
  5. Rodriguez de la Torre B, Dreher J, Malevany I, et al. "Serum levels and cardiovascular effects of tricyclic antidepressants and selective serotonin reuptake inhibitors in depressed patients." Ther Drug Monit 23 (2001): 435-40
  6. Cerner Multum, Inc. "Australian Product Information." O 0
  7. Pacher P, Kecskemeti V "Cardiovascular side effects of new antidepressants and antipsychotics: new drugs, old concerns?" Curr Pharm Des 10 (2004): 2463-75
  8. Andrews C, Pinner G "Postural hypotension induced by paroxetine." BMJ 316 (1998): 595
View all 8 references

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Moderate

dilTIAZem food

Applies to: Teczem (diltiazem / enalapril)

MONITOR: Calcium-containing products may decrease the effectiveness of calcium channel blockers by saturating calcium channels with calcium. Calcium chloride has been used to manage acute severe verapamil toxicity.

MANAGEMENT: Management consists of monitoring the effectiveness of calcium channel blocker therapy during coadministration with calcium products.

References

  1. Henry M, Kay MM, Viccellio P "Cardiogenic shock associated with calcium-channel and beta blockers: reversal with intravenous calcium chloride." Am J Emerg Med 3 (1985): 334-6
  2. Moller IW "Cardiac arrest following intravenous verapamil combined with halothane anaesthesia." Br J Anaesth 59 (1987): 522-6
  3. Oszko MA, Klutman NE "Use of calcium salts during cardiopulmonary resuscitation for reversing verapamil-associated hypotension." Clin Pharm 6 (1987): 448-9
  4. Schoen MD, Parker RB, Hoon TJ, et al. "Evaluation of the pharmacokinetics and electrocardiographic effects of intravenous verapamil with intravenous calcium chloride pretreatment in normal subjects." Am J Cardiol 67 (1991): 300-4
  5. O'Quinn SV, Wohns DH, Clarke S, Koch G, Patterson JH, Adams KF "Influence of calcium on the hemodynamic and anti-ischemic effects of nifedipine observed during treadmill exercise testing." Pharmacotherapy 10 (1990): 247
  6. Woie L, Storstein L "Successful treatment of suicidal verapamil poisoning with calcium gluconate." Eur Heart J 2 (1981): 239-42
  7. Morris DL, Goldschlager N "Calcium infusion for reversal of adverse effects of intravenous verapamil." JAMA 249 (1983): 3212-3
  8. Guadagnino V, Greengart A, Hollander G, Solar M, Shani J, Lichstein E "Treatment of severe left ventricular dysfunction with calcium chloride in patients receiving verapamil." J Clin Pharmacol 27 (1987): 407-9
  9. Luscher TF, Noll G, Sturmer T, Huser B, Wenk M "Calcium gluconate in severe verapamil intoxication." N Engl J Med 330 (1994): 718-20
  10. Bar-Or D, Gasiel Y "Calcium and calciferol antagonise effect of verapamil in atrial fibrillation." Br Med J (Clin Res Ed) 282 (1981): 1585-6
  11. Lipman J, Jardine I, Roos C, Dreosti L "Intravenous calcium chloride as an antidote to verapamil-induced hypotension." Intensive Care Med 8 (1982): 55-7
  12. McMillan R "Management of acute severe verapamil intoxication." J Emerg Med 6 (1988): 193-6
  13. Perkins CM "Serious verapamil poisoning: treatment with intravenous calcium gluconate." Br Med J 2 (1978): 1127
  14. Moroni F, Mannaioni PF, Dolara A, Ciaccheri M "Calcium gluconate and hypertonic sodium chloride in a case of massive verapamil poisoning." Clin Toxicol 17 (1980): 395-400
View all 14 references

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Therapeutic duplication warnings

No warnings were found for your selected drugs.

Therapeutic duplication warnings are only returned when drugs within the same group exceed the recommended therapeutic duplication maximum.

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Drug Interaction Classification

These classifications are only a guideline. The relevance of a particular drug interaction to a specific individual is difficult to determine. Always consult your healthcare provider before starting or stopping any medication.
Major Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit.
Moderate Moderately clinically significant. Usually avoid combinations; use it only under special circumstances.
Minor Minimally clinically significant. Minimize risk; assess risk and consider an alternative drug, take steps to circumvent the interaction risk and/or institute a monitoring plan.
Unknown No interaction information available.

Further information

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