Yup they can fail if your body isnt ready to labour. They can put artificial hormones into your body, but your uterus also needs receptors to make it all work. When your body is ready to labour, it will have receptors galore If you have a failed induction with synto (drip) the next step is usually a caesarean.

You can read my controversial article here: https://www.bellybelly.com.au/birth/...-or-not-induce