Medicine and vaccine doubt. Wil come?

My father age 67 and mother age is 61. 3dayss back my father was not well like (mild cold, not able to smell). 2days back my mother was not week chillness and cold. So we asked our familyto prescribe so deficiency... He referred three tablets 1.doxycycline 2. Flucold 3. Wysolone 10mg . they both put 1st dose of vaccine on 30th April. Today it's 17days of vaccine. They had these tablets only at morning and night' for 3days. Now they are fine but only mild cold for mom and smel can't find for father. Remaining they are doing works and all fine.. their next vaccine of 2nd dose is on May 28th? Whether we can put vaccine on thaat day or after how many day to take? After having these three tablets they can take vaccine or anysode effect wil come?