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Logic Firm (Was Diar-Stop)
Next day delivery*
Place your order by 12 noon and we'll get it to you the next working day.
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*Mon-Fri only, products must be in stock
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Logic Firm (Was Diar-Stop)

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39 Reviews

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Estimated dispatch within 24 hours (subject to stock) See our delivery options


Logic Diar-stop (Previously Diarsanyl Plus)

Diar-Stop is a pharmaceutical grade formulation which helps manage digestive upsets in dogs and cats when the intestines become irritated.

This can be caused by a sudden change in diet or by eating inappropriate food e.g. scavenging, on a walk or eating from the rubbish bin.

Diar-Stop has an easy-to-use syringe and palatable formula that uses Montmorillonite (Coats, protects the intestinal lining/ absorbs toxins), Sodium Magnesium Potassium (to help restore electrolytes lost through diarrhoea), Dextrose (provides an energy source for the small intestine) and Prebiotics (FOS – fructo-oligosaccharides) to restore the normal bacterial flora.

For orders over £29 postage is free. For orders under £29 we charge £2.99 for postage

For Light items (under 2kg) our standard method is Royal Mail Second Class (there are a few exceptions, so if in doubt check our Delivery page).

To get it faster you can upgrade Light items to Royal Mail 1st Class or a Guaranteed Next Day Courier service, Saturday Courier or even before 12 noon services. There's a small fee, but if you're in a hurry they are worth considering. To qualify for next working day delivery, orders must be placed before 12 Noon Monday to Thursday. There is no standard Saturday courier delivery.

Heavy items weighing 2kg and more are sent via courier. If ordered before noon Monday to Thursday, Heavy items will be delivered next working day. Heavy items ordered after 12 Noon Friday, or anytime Saturday and Sunday will dispatched on Monday for a Tuesday delivery.

Please note that if you are purchasing a mix of Light and Heavy items at the same time, these will be sent separately. The Heavy items being sent by Courier, the Light items by Royal Mail Second Class.

All exceptions to these guidelines are noted in the product description.
For more information, view our Delivery page.

Feedback for Logic Firm (Was Diar-Stop) has been compiled from 39 customer reviews


With 4 German Shepherds to care for, we always keep a couple of tubes of Diar-Stop in the cupboard, and use it at the first sign of diarrhoea. A good product that seems to work well. Easy to administer, as the dogs will take it on top of their food or will even lick it off a spoon.


Very effective for my dog with sensitive stomach.


Effective product. Works quickly with upset stomach problems.


have used this product before and saved lots of money on vet bills


My dog is a Labrador and eats anything so I keep this dairrhoea medicine in stock for emergencies


Works well and dogs love it so its easy to give


I haven't used this particular tube yet as it's back-up for emergencies! I have used this brand and product before and it works wonders when my German Shepherd has diarrhoea!


Great product firms the stools well without any side effects on the dog. My vet recommends this product but obviously it is more expensive buying from the vet.


Good price quick delivery


at least a £1 cheaper than other sights and definitely cheaper than the vets. does it's job

View all 39 reviews