Investigational drugs for vasospasm after subarachnoid hemorrhage.

Nimodipine is the only FDA-approved medication with neuroprotective effect and able to improve outcomes after aSAH. Understanding nimodipine trials is mandatory to understand and criticize all the drug trials published until now. The mechanism to vasospasm is multifactorial and not completely understood and all the other attempts to find a better medication could not prove superior results. Newton and PEGylated Carboxyhemoglobin Bovine can be potentially effective to prevent vasospasm but we still need more data and large studies. Future research should investigate newer drugs, as well as the combination of multiple drugs therapy and the association with blood evacuation techniques.