Welcome to HealthcareMagic forum.
I understand your concern as a vigilant parent . Please do not worry.
Reflux is common in infants and many do overgrow it ( depending on the severity). Lanzol
15 is an antacid( lansoprazole
) used to decrease acid reflux
& might take a few weeks for showing full efficacy.
It sometimes does have some abdominal discomfort as a sideffect too but if only a morning single dose is taken then it's unlikely to cause any problems at night.
It's not clear when you have started lanzol and it's relation to the present acute discomfort .
It's advisable that you get your child evaluated to rule out any persistent reflux symptoms to confirm the diagnosis & start appropriate management.
If needed your doctor might want to give a trial of other antacids like ranitidine
etc. which can help in controlling his reflux.
Wishing your child good health.