Answer

Generally, during chovihār, water is not taken after sunset. Medicine is a special case: if it is medically necessary, many Jain traditions allow it, but it should be taken with proper discretion and according to your guru, family tradition, or sect guidance.

Explanation

Chovihār usually means:

• no food after sunset
• no water after sunset

For medicine, Jain tradition gives importance to health and necessary care. So if a medicine must be taken for treatment, it is usually considered acceptable, even during chovihār. But if it is only for comfort or can be avoided, one should be more careful.

Spiritual Understanding

Jain Dharma teaches ahiṃsā and self-discipline. Chovihār is a practice of restraint, but necessary medicine is not treated the same as ordinary intake because preserving health is also important for spiritual practice.

Takeaway

• Water: normally not taken during chovihār
• Medicine: may be taken if truly necessary, preferably with guidance

If you want, I can also explain what counts as chovihār in simple Jain practice.