The only ventral horn cell disease famous in India is Polio which was successfully eradicated. During it's era, other diseases with similar clinical picture, such as Kugelberg-Welander syndrome, Cerebral palsy, Friedreich's Ataxia, Spina Bifida etc were rampantly misdiagnosed as Polio.
Hence after it's eradication the incidence of these rare disorders has increased!
The disease is also known as "Infantile paralysis" and this moniker can't be more inaccurate. The commonest manifestation of this disease is Aseptic meningitis presenting with headache, photophobia, etc. And only 1% cases develop into paralytic poliomyelitis. And another point is that adults are 15 times more likely to become paralysed and are more likely to die.
Sorry for going off topic above; couldn't help it. Fortunately there are no drugs that are known to cause ventral horn cell disease. But there is one chemical called- TriocP, full form is tri-ortho-cresyl phosphate. It is illicitly used as a component of country liquor especially in USA; and in Mediterranean countries it was used as an adulterant in cooking oil.
Another toxic cause is Tick paralysis. The ixodes tick secretes a toxin that can cause Ataxia, flaccid asending paralysis, bulbar palsy etc closely mimicking Guillian barre's syndrome.