Medical donations taxability

Yes, the amount is taxable since it is not received from relatives.

If the amounts are received by cheques and you intend to repay them at a later stage as convenient to you, you can treat them as unsecured loans. They will not be taxable.

You can claim deduction u/s 80DDB max Rs 40000/-if you can obtain a certificate in form no 10-I from prescribed specialist against your income.