Bud provided some good information, and a brief overview of Echis taxonomy - which is a complete nightmare in itself - as it is currently accepted.
The specimens of Echis carinatus that Barry mentioned were produced from parent animals that were imported from Pakistan in 2001. By current taxonomic standings, Echis carinatus has five subspecies, at least three of which have been given full species status by some authors. The five subspecies include E.c.carinatus (peninsular India), E.c.aliaborri (referred to as E.varia by Cherlin & Borkin, 1990), E.c.astolae (Astola Island), E.c.sinhaleyus (Sri Lanka), E.c.sochureki (India, Bangladesh, Afghanistan, Pakistan, Iran, Iraq, SE Arabian peninsula; treated as full species by Cherlin 1984 & 1990 and by Okuda et al 2001), and E.c.multisquamatus (NW Baluchistan in Pakistan northwest into Turkmenistan), which is also viewed as a full species by some authors.
When the said specimens originally entered the United States in 2001, no detailed locality data was available other than the country of origin. Further research and morphological comparison revealed that these specimens are with near certainty E.c.sochureki, rather than E.c.multisquamatus, the other subspecies of Echis carinatus found in Pakistan.
Thus, the antivenin that would likely prove most effective would be the following:
Antivenom Name: Polyvalent Antisnake Venom Serum
Manufacturer: Biological Production Division, National Institute of Health
Phone: ++92-51-925-5090 (up to -94)
++92-51-925-5110 (up to -14)
Address: Islamabad
Country: Pakistan
There are also several other antivenin produced in India that may prove to be effective against envenomation by E.c.sochureki.
Hope this helps.
Best regards,
~TE
