Charak Samhita
षष्ठे हिक्का, भङ्गः स्कन्धस्य तु सप्तमेऽष्टमे मरणम् । नॄणां, चतुष्पदां स्याच्चतुर्विधः, पक्षिणां त्रिविधः ॥२१॥
In the sixth stage, the patient suffers from hiccup.; In the seventh stage, the patient suffers from skandha-bhanga (paralysis of the muscles in the shoulder girdle); and In the eighth stage, the patient succumbs to death. The above mentioned eight stages of poisoning are manifested in human beings.[ Stage wise features in animals and birds] In quadruped animals, the effects of poisoning are manifested in four different stages; and in birds, it is manifested in three stages.
english translation
SaSThe hikkA, bhaGgaH skandhasya tu saptame'STame maraNam । nRRNAM, catuSpadAM syAccaturvidhaH, pakSiNAM trividhaH ॥21॥
hk transliteration by Sanscript