There are no such restriction for Medical graduate to be ineligible for the NEET. So you can obviously apply for the examination but you should keep the age criteria in mind. To be eligible for NEET you must be in a age range of 17 years to 25 years. There are no limits in number of attempts so you can sit for NEET again if you wish to go for it.

To know more about NEET visit the link below:

https://medicine.careers360.com/exams/neet

I hope this answer helps. All the very best for your future endeavors!