Typhoid fever will take quite some time to reduce. But temperature can't be so high. Correct antibiotic is to be used. Probably your friend might have used antibiotics more during other times. Generally doctors will do culture test and decide on the antibiotic to be used.
General treatment for Typhoid is antibiotics, paracetamol and vitamins. Generally doctors prescribe ciprofloxacin or ceftriaxone. Adequate water is to be taken to get rehydrated. But it is always advisable to use medicines as per the advice of a good doctor. Before prescribing the medicines the doctor will confirm the typhoid by clinical tests.
There are some home remedies for typhoid. But don't depend on these when the problem is severe. You should consult a good doctor preferably a MD general physician and go as for advice. I am giving some home remedies which I come across.
1. 2 nos of garlic cloves with empty stomach early in the morning is suggested. You have to take for about 15 days.
2. Make a mixture of one teaspoon full garlic paste in 8 cups of water. Then add 2 cups of milk and mix them in a mixer thoroughly. Then evaporate the mixture till 75% evaporates and 25% will remain. The patient can take this solution one teaspoonful at a time and 3 times in a day.
3. Take 8 nos basil leaves and 14 numbers black pepper and 14 nos of strands of saffron. Make a paste and make small tablets with that paste. Daily take 2 or 3 tablets till the fever comes down.
4. Take a fresh lemon and cut into two pieces and take the juice. Mix it with 2 tablespoons of honey and drink. You have to take two times a day.
With the above information I again advise you to take your friend to a good MD general physician and follow his advice and use medicines prescribed. That will be the best course of action.