Temsirolimus, an inhibitor of mTOR, is an antineoplastic agent.

Temsirolimus is a white to off-white powder with a molecular formula of C56H87NO16 and a molecular weight of 1030.30. It is non-hygroscopic. Temsirolimus is practically insoluble in water and soluble in alcohol. It has no ionizable functional groups, and its solubility is independent of pH.

The chemical name of temsirolimus is

(3S,6R,7E,9R,10R,12R,14S,15E,17E,19E,21S,23S,26R,27R,34aS)-9,10,12,13,14,21,22,23,24,25, 26,27,32,33,34,34a-Hexadecahydro-9,27-dihydroxy-3-[(1R)-2-[(1S,3R,4R)-4-hydroxy-3-methoxycyclohexyl]-1-methylethyl]-10,21-dimethoxy-6,8,12,14,20,26-hexameth3H-pyrido[2,1-c][1,4]oxaazacyclohentriacontine-1,5,11,28,29(4H,6H,31H)-pentone 4′-[2,2-bis(hydroxymethyl)propionate]; or Rapamycin, 42-[3-hydroxy-2-(hydroxymethyl)-2-methylpropanoate].

TORISEL (temsirolimus) injection, 25 mg/mL, is a clear, colorless to light-yellow, non-aqueous, ethanolic, sterile solution. TORISEL (temsirolimus) injection requires two dilutions prior to intravenous infusion. TORISEL (temsirolimus) injection should be diluted only with the supplied DILUENT for TORISEL.

DILUENT for TORISEL is a sterile, non-aqueous solution that is supplied with TORISEL injection, as a kit.

TORISEL (temsirolimus) injection, 25 mg/mL:

Active ingredient: temsirolimus (25 mg/mL)

Inactive ingredients: dehydrated alcohol (39.5% w/v), dl-alpha-tocopherol (0.075% w/v), propylene glycol (50.3% w/v), and anhydrous citric acid (0.0025% w/v).

DILUENT for TORISEL

Inactive ingredients: polysorbate 80 (40.0% w/v), polyethylene glycol 400 (42.8% w/v), and dehydrated alcohol (19.9%w/v).

After the TORISEL (temsirolimus) injection vial has been diluted with DILUENT for TORISEL, in accordance with the instructions in section 2.5, the solution contains 35.2% alcohol.

TORISEL (temsirolimus) injection and DILUENT for TORISEL are filled in clear glass vials with butyl rubber stoppers.

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