Yea, imo, it's unsafe...according to a dick (oops, I mean quick) google search extenze contains yohimbe and other potential stimulants and herbs that I personally wouldn't advise combining with RIMA's, but I can't say for certain exactly how much risk there is.
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Supplement Facts for ExtenZe
Servings Size: 1 Tablet
Servings Per Container: 30
Amount Per Serving
%DV
Folate (Folic Acid)
400mcg
100%
Zinc (as Zinc Oxide)
25mg
167%
Extenze Male Prohormone Support
60mg
*
Micronized DHEA (dehydroepiandrosterone)
50mg
Pregnenolone (3B-hydroxypregn-5-en-10-one)
10mg
Extenze Bio-Enhancement Support
25mg
*
Black Pepper (seed)
Piper Longum (seed)
Ginger (root)
ExtenZe Sexual Repsonse Enhancement Support 600mg*
Medically Designed, Proprietary, Synergistic Blend of the finest quality herbal and nutritional Sexual Response Enhancement Support Ingredients:
Yohimbe Extract (bark) Provides 12.5mg Yohimbe alkaloids
Tribulus terrestrius Extract (aerial part and fruit) Provides 50mg furansterols
Korean Ginseng Extract (root) Standardized to 10% ginsenosides
Cnidium monnier (seed)
Eleutherococcus Extract (root) Standardized to .8% eleuthrosides
Xanthroparmelia scarbosa (aerial part)
Gamma-Aminobutyric Acid - GABA
Velvet Deer Antler
Horny Goat Weed (leaf)
Damiana (leaf)
Muira puama Extract (stem)
pumpkin (seed)
Stinging Nettle (root)
Astragalus (root)
Licorice Extract (root)
L-Arginine Hydrochloride
Ho Shou Wu Extract (root)
Boron (as chelate)