Which medicine is suitable for fungal infection in penis and how to stop spreading?

You need an: Antifungal from your doc. Keep the area as clean and dry as possible. Fungi love damp dark places. Change underwear daily.

None: Fungal penile infections are uncommon in healthy males. Perhaps you mean a urinary tract infection? In anyways, antibiotics and antifungal medications are usually not prescribed without being seen and evaluated by a physician. I recommend you see your primary care doctor. Gd luck!