Abbott Nutrition Multi-Thick Instant Thickener Multi-Thick Instant Thickener is a modified maize starch instant food & fluid thickener which has been designed for the dietary management of patients with dysphagia. Multi-Thick is a powder that can be mixed into a variety of food & drink, including warm & cold drinks, pured food & oral nutritional drinks. Before taking Abbott Multi-Thick, you should consult a healthcare professional who will advise you on the quantity of Multi-Thick to be used to thicken food & drink to the appropriate consistency.