Your problem needs to be evaluated properly in detail. 

Consult ayurveda physician for proper diagnosis and root cause of ailments before consuming any medicine

Thanks for trusting Ayurved and choosing to seek a second opinion from Ayurveda Dr Satish. It's Very scientific to note significance  to assessment of digestion via stool examination.

Stop this medicine.first of all take triflachurnwith lukewarm water at night before sleep for constipation.

Mushy or powdery stools are not necessarily unhealthy stools. The goal is a soft, formed stool that passes without excessive straining, rather than trying to make every bowel movement perfectly “sausage-shaped.” In IBS, stool consistency can fluctuate with food, stress, sleep pattern and bowel motility. The fact that your weight seems to increase when stools are firmer and decrease after loose/mushy stools is usually related to water and intestinal contents, not actual gain or loss of body fat. Regarding Stop IBS, Mustakarishta, Shelcal-HD and Uprise-D3 60K, they should not automatically be continued for 3–6 months simply because they are helping. The appropriate duration depends on why each was started, the formulation/dose and your response. In particular, calcium and vitamin-D preparations should have a clear indication rather than being continued indefinitely.

Consult

Hello, I understand your concern - mushy, powdery stool with weight loss is distressing. In Ayurveda this is Grahani / IBS with Agnimandya. Firmer, sausage-shaped stool comes when Agni is corrected, not by long-term use of Stop IBS or supplements Please book a private consultation - I can guide you with a safe, sustainable plan after detailed history.

“Stop-IBS and Mustakarishta should not be continued for 3–6 months automatically; the duration depends on your symptoms and response, and long-term use should be supervised. Stop-IBS is a multi-herbal digestive formulation, while Mustakarishta is a fermented preparation. For mushy/powdery stools, the goal is to identify why stool consistency is abnormal rather than simply increasing medicines. Adequate fluids, regular meals, soluble fibre and gradual dietary correction can help. Shelcal-HD and Uprise-D3 60K should also be continued according to your vitamin D/calcium reports and doctor's advice rather than indefinitely. The repeated weight change you describe with bowel movements also needs evaluation. Please consult me with your recent reports, weight history and current doses so I can assess your digestion and suggest a suitable plan.”