Can't the after effects of meningitis be reduced to some level, by use of medicines or any medical treatment?

Yes: Bacterial meningitis can be treated with antibiotics. Death and neurological complications can occur but treatment with antibiotics can reduce this risk.

Effects ????: If your question concerns the long term residual effects of this terrible disease the answer is maybe. Once meningitis has killed pockets of nerve cells they will never grow back or function normally.They also leave behind scars that may trigger seizures that may be controlled with medicine. Physical therapy and retraining can regain some functions but others may be gone forever.