Pancreatic enzyme replacement therapy (PERT, pancreatin, Creon) for pancreatic exocrine insufficiency: why and how to take it

Pancreatic exocrine insufficiency arises when the tumour blocks the main duct or the gland is removed or atrophied; the signs are pale, loose, oily stools that float and are hard to flush, bloating, wind and weight loss despite eating (Cancer Research UK symptoms page). Enteric-coated pancreatin (porcine lipase, amylase and protease in acid-resistant granules) is swallowed with the first mouthfuls of every meal and snack and titrated to symptoms and weight. NICE NG85 offers it to everyone with unresectable pancreatic cancer (1.6.1), asks clinicians to consider it before and after resection (1.6.2), recommends early enteral over parenteral nutrition after pancreatoduodenectomy (1.6.4) and advises against fish oils as a treatment for weight loss in unresectable disease (1.6.3); a note added in September 2024 records that supplies were disrupted and points prescribers to the Specialist Pharmacy Service tool for equivalent products. In the UK Clinical Practice Research Datalink, only 987 of 4,554 patients with pancreatic adenocarcinoma (21.7 percent) received enzyme replacement; in 807 propensity-matched pairs, adjusted median survival was 2.62 times longer in treated patients, a difference that held whether or not they had surgery or chemotherapy, although an observational study cannot exclude that fitter patients were more likely to be prescribed it (Roberts 2019). Weight loss in pancreatic cancer has three causes that overlap, poor intake, malabsorption and cachexia; 85 percent of patients meet the definition of cachexia, and a review from the Pancreatic Cancer Action Network recommends dietitian assessment, calorie and protein support, enzyme replacement, appetite stimulants where appropriate and exercise (Hendifar 2019). Diabetes after pancreatic surgery or from the tumour is managed alongside (the type 3c diabetes term).

How to take it, from the living-with layer of this record. Pancreatic Cancer UK says PERT replaces the enzymes the pancreas would normally make, that most people with pancreatic cancer will need it, for life, and that it can make a big difference to how you feel and to coping with chemotherapy. Its dosing rules: take it with all meals and snacks and with drinks that are more than half milk; swallow the capsules whole with a couple of sips of a cool drink (hot drinks stop them working); take half with the first few mouthfuls and spread the rest through the meal; there is no set daily dose, so start with at least 50,000 or 75,000 units for a main meal and 25,000 or 50,000 for a snack and increase as needed (a healthy pancreas makes about 720,000 units for a small meal); take more for larger or fattier food, and with nutritional supplement drinks; do not cut fat out of your diet to manage symptoms. Capsules can be opened and the granules mixed with a teaspoon of cold acidic food such as apple sauce, never chewed or mixed with hot food. In hospital, ask to keep your PERT with you so it is taken with food, not at drug rounds.

If symptoms persist: check the dose and timing, ask about a proton pump inhibitor (stomach acid stops the enzymes working), a different brand, or another cause such as bile acid diarrhoea, small intestinal bacterial overgrowth or medicines. Extra enzymes pass harmlessly through. The UK consensus guideline (Phillips 2021) sets the same starting doses, and a population-based study (Roberts 2019) found people prescribed enzymes lived longer. NICE NG85 says offer enteric-coated pancreatin for unresectable disease and consider it before and after resection; it notes the 2024 supply disruption and points prescribers to the Specialist Pharmacy Service tool for equivalent products. All PERT is pork-derived; Pancreatic Cancer UK says organisations representing Jewish and Muslim communities and the Vegetarian and Vegan Societies have said its use is acceptable. This is orientation from public patient pages and guidelines, not advice for your case: your own team's instructions and 24-hour number come first.