Candy:

Maybe this will help. I also take Xanax daily and I believe that the grapefruit juice DECREASES the effects, is why it's a big no-no but there's some more info below:

Possible food and drug interactions when taking this medication

Xanax may intensify the effect of alcohol. Do not drink alcohol while taking this medication.

Never combine Xanax with Sporanox or Nizoral. These drugs cause a buildup of Xanax in the body.

If Xanax is taken with certain other drugs, the effects of either could be increased, decreased, or altered. It is important to check with your doctor before combining Xanax with the following:

Amiodarone (Cordarone)
Antihistamines such as Benadryl and Tavist
Carbamazepine (Tegretol)
Certain antibiotics such as Biaxin and erythromycin
Certain antidepressant drugs, including Elavil, Norpramin, and Tofranil
Cimetidine (Tagamet)
Cyclosporine (Neoral, Sandimmune)
Digoxin (Lanoxin)
Diltiazem (Cardizem)
Disulfiram (Antabuse)
Ergotamine
Fluoxetine (Prozac)
Fluvoxamine (Luvox)
Grapefruit juice
Isoniazid (Rifamate)
Major tranquilizers such as Mellaril and Thorazine
Nefazodone (Serzone)
Nicardipine (Cardene)
Nifedipine (Adalat, Procardia)
Oral contraceptives
Other central nervous system depressants such as Valium and Demerol
Paroxetine (Paxil)
Propoxyphene (Darvon)
Sertraline (Zoloft)

Hope this helps. Take Care,
Kimberly.