1. No caffeine, coffee, alcohol, tea, cocoa products, banana, and vanilla products intake should occur 48 hours before urine collection or during urine collection.
2. Avoid the following medications for 48 hours before urine collection or during urine collection:
- Aspirin
- Acetaminophen
- Aminophylline
- Amphetamines
- Appetite suppressants
- Bromocriptine
- Buspirone
- Chloral hydrate
- Chlorpromazine
- Clonidine
- Dexamethazone
- Diuretics
- Dopamine
- Epinephrine
- Guanethidine
- Hydralazine
- Hydrocortisone
- Imipramine
- Insulin
- Isoetharine
- Levodopa
- Lithium
- Methyldopa
- MAO inhibitors
- Nalidixic Acid
- Nitroglycerin
- Nose drops
- Phenacetin
- Phenothiazine
- Phenobarbital
- Phenylephrine
- Propafenone
- Respine
- Salicylates
- Tetracycline
- Theophylline
- Tricyclic antidepressants
- Vasodilators
3. Avoid products with nicotine during 24-hr urine collection
4. Avoid stress during test, take enough rest, and take adequate food and fluids.
5. Avoid vigorous exercise before and during urine collection