Dear patient Every medicine has side effects and so has the medication u have been prescribed. But they are not significant. Of all of them pregabalin should be taken only at bedtime as it leads to giddiness and headache if taken in day time. Cholecalciferol is vitamin d3 and methylcobalamin is vitamin B12 which has no side effects if taken in recommended dosage. Tab patova is antacid and tab egact is pain killer and has minimal side effects. So do not worry and start taking your medication.