This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Causing or producing convulsions.

n. An agent, such as a drug, that causes convulsions.

adj. Causing or producing convulsions; convulsive.

n. An agent, such as a drug, that causes convulsions; a convulsant agent.

Causing muscular spasms.

n. An agent which causes muscular spasms.

"Half received treatment with the drug topiramate, an anti-convulsant sold under the brand name Topamax, while the other half received a placebo."