it is a new drug in the treatment of anal fissure. it is a cream containing glyceryl trinitrate.
a pomade that causes pressure and pain in my head, not even a minute after using it.
there is also an equivalent called rectogesic. while it has high success in acute anal fissures, it does not benefit much in chronic cases.
important : drink a strong coffee when your headache starts
edit: the reason for your headache; when the drug is absorbed, it dilates the blood vessels. coffee narrows you down and you relax.