The following medications MUST BE STOPPED 14 days prior to your visit to the NIH
- All H2 Blockers: (for stomach/digestive problems) Nexium, Pepsid, Zantac, Prevacid, Prilosec, Gaviscon, Axid (Nizatidine), Tagamet, Tums
- Tricyclic and other antidepressants, such as Amitriptyline (Elavil), Imipramine (Topfranil), Nortriptyline (Aventyl)
- Anxiolytics (for anxiety) such as Xanax, Valium, Trazodone, Ativan, and other anti-anxiety medications.
- Sleep aids such as Ambien and Lunesta
- Monoamine oxidase inhibitors (deprenyl), Phenelzine (Nardil), tranylcypromine (Parnate), Selegiline (Eldepryl)
- Blockers (selective) such as Doxazosin (Cardura), Terazosin (Hytrin), Prazosin (Minipress)
- Antihistamines (for allergies) and cold/decongestant medications such as Benadryl, Dimedrol, Nytol, Unisom, Guaifenesin (Robitussin), Loratadine (Claritin), Fexofenadine (Allegra), Cetirizine (Zyrtec and Reactine)
- DDC inhibitors (for Parkinson's disease) such as Carbidopa/levodopa, Sinemet, Parcopa, Atamet
- Stimulants (for attention-deficit hyperactivity disorder) including Adderall, Dexedrine, Cylert, Ritalin
- Carbidopa must be stopped before your visit, can only be taken for the F-DOPA scan
Other Medication Restrictions
- All Tylenol/acetaminophen products, including Excedrin, Percocet and hydrocodone, must be stopped a minimum of 5 days prior to your visit to the NIH.
- Labetolol MUST BE STOPPED for 6 weeks prior to your visit to the NIH
- No caffeine or decaf products for a minimum of 24 hours prior to your visit
- No spicy foods, bananas, cheese, and citrus fruits for a minimum of 24 hours prior to your visit
- NO ALCOHOL for 24 hours prior to your visit
- NO SMOKING (cigarettes or marijuana) for 24 HOURS prior to your visit
- No food after midnight on the days of your appointments; please drink water except on the day of your CT scan (you must be dehydrated for the CT scan, you get a much more accurate reading)
- No gum, mints or candy when fasting (appointment days)
Preparation for Blood Draw (5SWDH or 1NWDH appointments)
- No food after midnight prior to blood draw
Preparation for CT Scanning
- No Metformin (anti-diabetic drug) 24 hours prior to CT scan
- **** 48 hours after scan, you need to check BUN and creatinine levels to determine if levels are normal before restarting Metformin
- **** If you are not at the NIH 48 hours after your CT scan, you are responsible for contacting your physician to check BUN and creatinine levels in order to start Metformin.
If you have been diagnosed with a pheochromocytoma or paraganglioma, no exercise until your lesion/tumor has been removed and your catecholamines are down to a normal level. Exercise increases catecholamine production.
If you have an allergy to contrast dyes, please let us know at least 2 weeks prior to your scheduled appointment. We can order the blockade (medication), for you to start the night before the scan, which will prevent you from having an allergic reaction to the contrast dye.
If you have a pacemaker, any metal implants or cannot have an MRI scan for any reason, please let us know as soon as possible.