Neem is an excellent medicine for fever, specially the periodic fever.
A few simple neem based recipes are as follows:
Leaves of neem and the bark of kokanar are to be taken in equal quantity and ground together to a fine degree. Give one or two mashas of this powder in fresh water to the patient before the onset of the recurrent fever. Quite likely the fever will subside that day itself or at least the severity of tremors of fever will be much less. This is said to be a sure remedy for fever accompanied with tremors, malaria and any other seasonal fever.
A very simple remedy that can be tried anywhere with practically no complex para-phernalia whatsoever is the following: Boil the green, fresh leaves of neem in water and let the patient drink this water prior to the accurence of the onset of the recurrent fever. Add a few grains of pepper if they are available. This will be decidedly better but in case pepper is not available, only neem leaf would do.
In case the fever is what is called jeema jwara in Ayurveda (viz when the fever persists continously in the body and does not respond favourably to any other type of medication), take the inner bark of neem (one tola) boil this in ten chatak of water till the net quantity of water becomes just one chatak only. Filter this and let the patient drink it for a few days. The persistent fever of the body will disappear.
A sure decoction for the malaria fever is: take a chatak of the innerbark of the root of neem, boil them in a required quantity of water for about fifteen minutes and then cool and filter. If no other medicine is acting, let the patient drink this decoction in a dosage of four to five tolas, two or three times before the next onset of the recurrent fever. Fever will subside.
This will be effective even for those patients where quinine is not effective. Infact, neem bark is considered to ,be a native quinine, if not a better drug than quinine.
Giving neem oil in a dose of five to ten drops twice a day is said to be helpful in old cases of malaria.