hi meghna.me thanks for choosing health care magic . Epsolin or Phenytoin in one of the most commonly used medication for epilepsy . In medical terms it is said to have a very narrow therapeutic index which means that it has to be maintainde within a narrow range for it to be effective . He most probably had his attack of fits as he mised his dose . If his seizures have reduced now then you can continue giving him the same medications. Also make sure that he does not miss any more of his medication . In case he continues to have seizures lasting more than 30 minutes with no recovery then its a condition termed as status epilepticus for which he will need to get admitted in the hospital for either a change of medication or increase the dose. he will also need a serum phenytoin level monitoring to see if his phenytoin (epsolin ) level in the body is adequate . hope i have answered your question adequately .