Initial effects can appear almost immediately after exposure and can cause death within minutes.[15] Humans exposed to a non-disabling dose which would be about .05 mg/m3 for twenty minutes, can experience headaches, eye pain, tightness in chest, rhino rhea, cramps, nausea, malaise and miosis. With a slightly more potent dose of .05 mg/m3 for 30 minutes effects include inhibition, dyspnea and SFEMG changes. The required dose for a rate of 50 percent lethality is 70 mg-min/m3.[14] VX is also another nerve agent like GB but is much more lethal.