I have been coughing for over a month what medicine should I tale?

Bromelain. Make sure you avoid smoking. Holistic rx use n - acetyl cysteine 600mg three times with bromelain three times a day. Apply oil of oregano mixed with neosporin to nostrils bid oregano kills virus neosporin kills bacteria. Youmight need antibiotic if this does not resolve cough after 7 days of treatment.
Hiradinitis supprati. This is called hiradinitis due to infection of sweat glands common if u use antiperspirant which blocks the sweat gland it might recur.