Alfuzosin; Silodosin; Tamsulosin/Grapefruit Juice Interactions
This information is generalized and not intended as specific medical advice. Consult your healthcare professional before taking or discontinuing any drug, changing your diet or commencing any course of treatment.
Very important. A change in your diet, medicine, or dosage may be necessary. Promptly consult your doctor or pharmacist.
How the interaction occurs:
Grapefruit juice may increase the amount of your prostate medicine in your blood.
What might happen:
When your prostate medicine is taken with grapefruit juice, the grapefruit juice may cause the medicine to build up in your body. This may cause more side effects than it normally does, including dizziness, fatigue, or fainting.
What you should do about this interaction:
While you are taking this medicine, you should avoid eating grapefruit or drinking grapefruit juice. You may choose an alternative citrus beverage (such as orange juice). In the event that you are instructed by a healthcare professional (e.g., doctor, pharmacist, or dietitian) to eat grapefruit or drink grapefruit juice you should discuss with your doctor the effects of grapefruit on the blood levels of this medicine. These effects can occur even if grapefruit is not consumed at the same time of the silodosin dose. This interaction may occur at any time in your treatment with silodosin if grapefruit or grapefruit juice is consumed. Let your doctor know if you have any problems with dizziness, fatigue, or fainting.Your healthcare professionals may already be aware of this interaction and may be monitoring you for it. Do not start, stop, or change the dosage of any medicine before checking with them first.
- 1.Uroxatral (alfuzosin hydrochloride) US prescribing information. Sanofi-Synthelabo, Inc. May, 2013.
- 2.Rapaflo (silodosin) US prescribing information. Watson Laboratories, Inc. July, 2013.
- 3.Flomax (tamsulosin hydrochloride) US prescribing information. Boehringer Ingelheim Pharmaceuticals, Inc. October 20. 2014.
- 4.Troost J, Tatami S, Tsuda Y, Mattheus M, Mehlburger L, Wein M, Michel MC. Effects of strong CYP2D6 and 3A4 inhibitors, paroxetine and ketoconazole, on the pharmacokinetics and cardiovascular safety of tamsulosin. Br J Clin Pharmacol 2011 Aug;72(2):247-56.
- 5.US Food and Drug Administration (FDA). Drug Development and Drug Interactions: Table of Substrates, Inhibitors and Inducers. Available at: https://www.fda.gov/drugs/drug-interactions-labeling/drug-development-and- drug-interactions-table-substrates-inhibitors-and-inducers. Updated 11/14/2017.
CONDITIONS OF USE: The information in this database is intended to supplement, not substitute for, the expertise and judgment of healthcare professionals. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects, nor should it be construed to indicate that use of a particular drug is safe, appropriate or effective for you or anyone else. A healthcare professional should be consulted before taking any drug, changing any diet or commencing or discontinuing any course of treatment.