Why Does One Have Persistent Cough After Taking Tablets?

i think i need to start again

6 months ago i had badly inflamed liver they didnt know why but i had lost some blood as well and my hemoglobin was very low and they kept me in hospital few days and gave me 3 bags of blood

I am now taking hydroxil every 8 hours and feel ok

the question i have is that i start coughing badly about 6=7 hours after the tablet why is that?