Whey Protein

Are there any interactions with medications?



Levodopa
Interaction Rating: Major Do not take this combination.

Whey protein might decrease how much levodopa the body absorbs. By decreasing how much levodopa the body absorbs, whey protein might decrease the effectiveness of levodopa. Do not take whey protein and levodopa at the same time.



Alendronate (Fosamax)
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.

Whey protein can decrease how much alendronate (Fosamax) the body absorbs. Taking whey protein and alendronate (Fosamax) at the same time can decrease the effectiveness of alendronate (Fosamax). Don't take whey protein within two hours of taking alendronate (Fosamax).



Antibiotics (Quinolone antibiotics)
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.

Whey protein might decrease how much antibiotic the body absorbs. Taking whey protein along with some antibiotics might decrease the effectiveness of some antibiotics. To avoid this interaction take whey protein supplements at least one hour after antibiotics.

Some of these antibiotics that might interact with whey protein include ciprofloxacin (Cipro), enoxacin (Penetrex), norfloxacin (Chibroxin, Noroxin), sparfloxacin (Zagam), trovafloxacin (Trovan), and grepafloxacin (Raxar).



Antibiotics (Tetracycline antibiotics)
Interaction Rating: Moderate Be cautious with this combination.
Talk with your health provider.

Whey protein contains calcium. The calcium in whey protein can attach to tetracyclines in the stomach. This decreases the amount of tetracyclines that can be absorbed. Taking calcium with tetracyclines might decrease the effectiveness of tetracyclines. To avoid this interaction, take whey protein two hours before or four hours after taking tetracyclines.

Some tetracyclines include demeclocycline (Declomycin), minocycline (Minocin), and tetracycline (Achromycin).

Dosing considerations for Whey Protein.

The following doses have been studied in scientific research:

BY MOUTH:
  • For improving athletic performance: 1.2-1.5 grams/kg of whey protein in combination with strength training for 6-10 weeks.
  • For HIV/AIDS-related weight loss: 8.4-84 grams of whey protein per day, or 2.4 grams/kg per day in a high-calorie formula, or 42-84 grams per day in a glutamine-enriched formula.

Therapeutic Research Faculty copyright

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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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