"He sustained bullet injury in the neck and was rushed to the civil hospital from where he was taken to N M Virani Wockhardt hospital," said B D Rabari, Assistant Commissioner of Police (Crime).
Prajapati (55) is an Ayurvedic doctor and runs a clinic here which he visits every Friday.
He parted way with Asaram after an over-decade-long association when the controversial spiritual leader was accused of raping a minor girl. He also gave statements against Asaram to the police.
Prajapati has police security, but the constable accompanying him had gone for lunch when the attack took place.