Psyllium can be used daily by many adults, but daily use should still be sensible.
The first question is why you are taking it. If your diet is low in fibre because meals are heavy in rice, refined flour, low vegetables or packaged snacks, the first step is improving food. Psyllium husk can help close a fibre gap, but it should not become an excuse to ignore dal, sabzi, fruits and whole grains.
Daily use also depends on tolerance. Some people feel comfortable with isabgol. Others feel bloated if they start too fast. Some dislike the texture. Some need medical advice because they take medicines or have digestive conditions. Fibre is common, but individual situations matter.
Use psyllium with enough water and do not swallow it dry. Start with a smaller serving. Keep a gap from medicines unless advised. Stop and seek advice if you have pain, vomiting, trouble swallowing or persistent bowel changes.
A daily fibre routine should feel boring and safe, not dramatic. Food first, water always, dose gradually.
Psyllium is useful because it is simple. It stays useful only when the routine is correct.
Daily fibre should feel unremarkable. If psyllium feels dramatic every day, the dose or the routine needs adjusting, not your willpower.