Pharmaceutical compositions are described for preventing TNF toxicity, comprising as active ingredient the stereospecific (+) enantiomer having 3S, 4S configuration of delta 6 tetrahydrocannabinol type compounds. The compositions are particularly effective in alleviating and even preventing neurotoxicity due to elevated levels of TNF, including septic shock, cachexia and trauma. They are also effective in the treatment of certain chronic degenerative diseases characterized by TNF production, including autoimmune diseases.
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