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Drug Interactions between Byvalson and Cystospaz-M

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

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Interactions between your drugs

Moderate

hyoscyamine nebivolol

Applies to: Cystospaz-M (hyoscyamine) and Byvalson (nebivolol / valsartan)

MONITOR: Anticholinergic agents frequently cause drowsiness and other central nervous system-depressant effects that may be additive with those induced by beta blockers. In addition, these agents may increase heart rate and theoretically may counteract the bradycardic effects of beta blockers. Pharmacokinetically, anticholinergic agents may delay the gastrointestinal absorption of beta blockers and other drugs that are administered orally. The proposed mechanism involves increased gastrointestinal transit time due to reduction of stomach and intestinal motility by anticholinergic agents. In healthy volunteers, pretreatment with propantheline has been shown to prolong the time to reach peak plasma concentration (Tmax) for both atenolol and metoprolol. Propantheline also decreased metoprolol peak plasma concentration (Cmax) but had no effect on its systemic exposure (AUC). In contrast, propantheline increased atenolol AUC but had no effect on its Cmax. The clinical relevance of these changes is probably minimal.

MANAGEMENT: Clinicians should be aware of the potential for diminished effects of beta blockers during coadministration with anticholinergic agents. Patients should also be monitored for potentially excessive CNS adverse effects (e.g., drowsiness, dizziness, lightheadedness, confusion, blurred vision) if these agents are used in combination. Patients should be counseled to avoid activities requiring mental alertness until they know how these agents affect them.

References

  1. Briant RH, Dorrington RE, Ferry DG, Paxton JW "Bioavailability of metoprolol in young adults and the elderly, with additional studies on the effects of metoclopramide and probanthine." Eur J Clin Pharmacol 25 (1983): 353-6
  2. Clark JM, Seager SJ "Gastric emptying following premedication with glycopyrrolate or atropine." Br J Anaesth 55 (1983): 1195-9
  3. Regardh CG, Lundborg P, Persson BA "The effect of antacid, metoclopramide, and propantheline on the bioavailability of metoprolol and atenolol." Biopharm Drug Dispos 2 (1981): 79-87
  4. Gilman AG, eds., Nies AS, Rall TW, Taylor P "Goodman and Gilman's the Pharmacological Basis of Therapeutics." New York, NY: Pergamon Press Inc. (1990):
  5. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  6. Cerner Multum, Inc. "Australian Product Information." O 0
View all 6 references

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Moderate

valsartan nebivolol

Applies to: Byvalson (nebivolol / valsartan) and Byvalson (nebivolol / valsartan)

GENERALLY AVOID: In the Valsartan Heart Failure Trial, the combination of valsartan with a beta-blocker and an ACE inhibitor was associated with unfavorable outcomes on morbidity and mortality in heart failure patients. The mechanism is unknown.

MANAGEMENT: The manufacturer recommends that the triple combination of valsartan with a beta-blocker and an ACE inhibitor be avoided in heart failure patients.

References

  1. Cerner Multum, Inc. "UK Summary of Product Characteristics." O 0
  2. Cerner Multum, Inc. "Australian Product Information." O 0

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Drug and food interactions

Moderate

valsartan food

Applies to: Byvalson (nebivolol / valsartan)

GENERALLY AVOID: Moderate-to-high dietary intake of potassium, especially salt substitutes, may increase the risk of hyperkalemia in some patients who are using angiotensin II receptor blockers (ARBs). ARBs can promote hyperkalemia through inhibition of angiotensin II-induced aldosterone secretion. Patients with diabetes, heart failure, dehydration, or renal insufficiency have a greater risk of developing hyperkalemia.

MANAGEMENT: Patients should receive dietary counseling and be advised to not use potassium-containing salt substitutes or over-the-counter potassium supplements without consulting their physician. If salt substitutes are used concurrently, regular monitoring of serum potassium levels is recommended. Patients should also be advised to seek medical attention if they experience symptoms of hyperkalemia such as weakness, irregular heartbeat, confusion, tingling of the extremities, or feelings of heaviness in the legs.

References

  1. "Product Information. Cozaar (losartan)." Merck & Co., Inc PROD (2001):
  2. "Product Information. Diovan (valsartan)." Novartis Pharmaceuticals PROD (2001):

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Moderate

hyoscyamine food

Applies to: Cystospaz-M (hyoscyamine)

GENERALLY AVOID: Use of anticholinergic agents with alcohol may result in sufficient impairment of attention so as to render driving and operating machinery more hazardous. In addition, the potential for abuse may be increased with the combination. The mechanism of interaction is not established but may involve additive depressant effects on the central nervous system. No effect of oral propantheline or atropine on blood alcohol levels was observed in healthy volunteers when administered before ingestion of a standard ethanol load. However, one study found impairment of attention in subjects given atropine 0.5 mg or glycopyrrolate 1 mg in combination with alcohol.

MANAGEMENT: Alcohol should generally be avoided during therapy with anticholinergic agents. Patients should be counseled to avoid activities requiring mental alertness until they know how these agents affect them.

References

  1. Linnoila M "Drug effects on psychomotor skills related to driving: interaction of atropine, glycopyrrhonium and alcohol." Eur J Clin Pharmacol 6 (1973): 107-12

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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

Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.