 In general, the effects of the bites of all kinds of tarantula are not well known.While the bites of many species are known to be no worse than a wasp sting, accounts of bites by some species are reported to be very painful and to produce intense spasms that may recur over a period of several days; the venom of the African tarantula "Pelinobius muticus" also causes strong hallucinations.For "Poecilotheria" species, researchers have described more than 20 bites with the delayed onset of severe and diffuse muscle cramps, lasting for several days, that in most cases resolved completely with the use of benzodiazepines and magnesium.