Drug Interactions between tamsulosin and timothy grass pollen allergen extract
This report displays the potential drug interactions for the following 2 drugs:
- tamsulosin
- timothy grass pollen allergen extract
Interactions between your drugs
tamsulosin timothy grass pollen allergen extract
Applies to: tamsulosin and timothy grass pollen allergen extract
GENERALLY AVOID: Alpha-adrenergic blockers and ergot alkaloids may attenuate the response to epinephrine in the treatment of serious systemic reactions, including anaphylaxis, that may occur during immunotherapy with allergenic extracts. Specifically, alpha-adrenergic blockers may antagonize the vasoconstricting and hypertensive effects of epinephrine, while ergot alkaloids can reverse the pressor effects of epinephrine.
MANAGEMENT: Immunotherapy with allergenic extracts may not be appropriate in patients receiving alpha-adrenergic blockers or ergot alkaloids, as these patients may be unresponsive to the usual doses of epinephrine required to reverse a systemic reaction.
References
- (2014) "Product Information. Grastek (timothy grass pollen allergen extract)." Merck & Co., Inc
- (2014) "Product Information. Ragwitek (ragweed pollen allergen extract)." Merck & Co., Inc
- (2014) "Product Information. Oralair (mixed grass pollens allergen extract)." Greer Laboratories Inc
- (2023) "Product Information. Palforzia (peanut allergen extract)." Aimmune Therapeutics
- (2022) "Product Information. Palforzia Level 1 (peanut allergen extract)." Aimmune Therapeutics UK Ltd
Drug and food interactions
tamsulosin food
Applies to: 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
- (2001) "Product Information. Flomax (tamsulosin)." Boehringer-Ingelheim
timothy grass pollen allergen extract food
Applies to: timothy grass pollen allergen extract
ADJUST DOSING INTERVAL: Since sublingual preparations of allergenic extracts are meant to be absorbed directly from tissues under the tongue into the blood stream, consuming food or beverage during or immediately after administration may reduce the systemic bioavailability of the medication.
MONITOR: Coadministration of allergenic extracts for allergy immunotherapy with alcohol may potentiate the risk of allergic reactions, including anaphylaxis. According to some studies, alcohol is an augmenting factor influencing immunological mechanisms that can induce more severe allergic reactions and is involved in up to 15% of cases of anaphylactic reactions. Proposed mechanisms include an increase in allergen absorption from altered permeability of the intestinal epithelial barrier, enhancing mast cell and basophil activation, and an increase in serum IgE concentrations. A causal relationship with all allergenic extracts has not been established.
MANAGEMENT: Food or beverage should not be taken with, or for at least 5 minutes after, the administration of sublingual allergenic extracts. Patients should also avoid swallowing for about 1 minute following placement of the allergen extract under the tongue. Caution is advised if allergenic extracts for immunotherapy are used concomitantly with alcohol. Some manufacturers of peanut allergen extract recommend alcohol not be consumed for 2 hours before, or 2 hours after taking peanut allergen extract and if alcohol use cannot be avoided, that withholding or decreasing peanut allergen dosage should be considered. Individual prescribing information should be consulted for further guidance and clinical monitoring may be considered.
References
- (2014) "Product Information. Grastek (timothy grass pollen allergen extract)." Merck & Co., Inc
- (2014) "Product Information. Ragwitek (ragweed pollen allergen extract)." Merck & Co., Inc
- (2014) "Product Information. Oralair (mixed grass pollens allergen extract)." Greer Laboratories Inc
- Cerner Multum, Inc. (2015) "Canadian Product Information."
- (2023) "Product Information. Palforzia (peanut allergen extract)." Aimmune Therapeutics
- (2022) "Product Information. Palforzia Level 1 (peanut allergen extract)." Aimmune Therapeutics UK Ltd
- Munoz-Cano R, Pascal M, Araujo G, et al. (2023) Mechanisms, Cofactors, and Augmenting Factors Involved in Anaphylaxis https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5623009/pdf/fimmu-08-01193.pdf
- (2023) "Product Information. Odactra (house dust mite allergen extract)." ALK-Abello Inc
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.
See also
Drug Interaction Classification
Highly clinically significant. Avoid combinations; the risk of the interaction outweighs the benefit. | |
Moderately clinically significant. Usually avoid combinations; use it only under special circumstances. | |
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. | |
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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