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Drug Interactions between dutasteride / tamsulosin and garlic

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

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Interactions between your drugs

Minor

tamsulosin garlic

Applies to: dutasteride / tamsulosin and garlic

Garlic has been found in some studies to lower blood pressure and may theoretically potentiate the effects of hypotensive agents. A meta-analysis of 11 randomized, placebo-controlled studies showed a mean decrease of 4.6 mmHg for systolic blood pressure and no significant effect for diastolic blood pressure in subjects treated with garlic (most often garlic powder 600 to 900 mg/day, providing 3.6 to 5.4 mg of the active component allicin) compared to placebo. In the subgroup analysis of studies where subjects had a mean baseline blood pressure in the hypertensive range (SBP 140 mmHg or higher; DBP 90 mmHg or higher), mean decrease associated with garlic was 8.4 mmHg and 7.3 mmHg, respectively, for systolic and diastolic blood pressure. There have been no reports of clinical hypotension associated with concomitant use of garlic and antihypertensive agents.

References (2)
  1. Richard CL, Jurgens TM (2005) "Effects of natural health products on blood pressure." Ann Pharmacother, 39, p. 712-20
  2. Tattelman E (2005) "Health effects of garlic." Am Fam Physician, 72, p. 103-6

Drug and food interactions

Moderate

tamsulosin food

Applies to: dutasteride / tamsulosin

ADJUST DOSING INTERVAL: Food may delay the gastrointestinal absorption of tamsulosin. The time to maximum plasma concentration (Tmax) is reached by 4 to 5 hours under fasted conditions and by 6 to 7 hours when tamsulosin is administered with food. The delay in Tmax has the desirable effect of smoothing the tamsulosin plasma concentration profile, thereby reducing fluctuation of the plasma peak and trough concentrations with multiple dosing. Food may also affect the extent of absorption of tamsulosin. It has been reported that taking tamsulosin under fasted conditions results in a 30% increase in bioavailability (AUC) and 40% to 70% increase in peak plasma concentration (Cmax) compared to fed conditions. The effects of food on the pharmacokinetics of tamsulosin are consistent regardless of whether tamsulosin is taken with a light meal or a high-fat meal.

MANAGEMENT: To ensure uniformity of absorption, tamsulosin should be administered approximately one-half hour following the same meal each day.

References (1)
  1. (2001) "Product Information. Flomax (tamsulosin)." Boehringer-Ingelheim

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.

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