Vivitonin 50mg tablets are used for improvement in dullness lethargy and overall demeanour in dogs vivitonin is particularly useful in older dogs where it may increase willingness to exercise and exercise tolerance a vet prescription is required for the medicine you have chosen if you do not yet have a prescription then you can print out the following blank veterinary prescription form which you can ask your vet to fill in when you next visit please note that changes to legislation in 2005