My animal is perfectly fine after three days: can I stop?

No, and this is the single most important point in the guide. Rapid improvement is normal and wanted, but it does not mean the infection has been cleared: it means the weakest bacteria are dead and the more resistant ones remain. Stopping now leaves them free to bounce back, often in a form less sensitive to the drug, and the result is a relapse that is harder to treat. Always complete the number of days prescribed. If you think the course is too long or the drug is upsetting the animal, discuss it with the vet rather than deciding to stop on your own.

I forgot a dose: do I make it up by doubling the next one?

Almost never. The general rule is that if you notice shortly after the time you give the dose at once, whereas if the next one is nearly due you skip the missed one and carry on as normal, never doubling to compensate. Doubling does not speed up recovery and raises the risk of side effects. If you have skipped several doses in a row or do not know how to get back on schedule, call the clinic: it is a common question and they will tell you exactly how to resume without a mess.

Can I hide the tablet in food to get it eaten?

Often yes, with two cautions. The first is that some antibiotics should be given away from meals because food reduces their absorption: check the leaflet or ask the vet. The second is that you must be sure the animal eats the entire portion the tablet is hidden in, otherwise it gets only part of the dose. With a suspicious animal it helps to use a small, tempting treat given whole, and to check it is actually swallowed rather than spat out moments later.

I have tablets left over: do I keep them for next time?

No. Leftover antibiotic should not be kept to self treat a future problem, nor used on another animal. The right drug, dose and length depend on the type of infection, the weight and the species, and using a random leftover risks an inadequate course that worsens resistance. The correct way to handle leftovers is to return them to the pharmacy for disposal. If you have quite a few doses left over, though, it is worth asking whether you really completed the course or stopped it earlier than planned.

Health management25 minLevel: BeginnerUpdated on August 19, 2026

Finishing a course of antibiotics properly, with no slip ups

Do not stop at the first improvement: how to keep to times and dose, recover a missed dose, store the medicine and close the course safely.

Audience: Pet owners
Species: Dog, Cat, Rabbit, Rodents
Scope: Valid everywhere, Italy, European Union

What you need before you start

La confezione e il foglietto illustrativo del farmaco prescritto dal veterinario
La prescrizione con dose, numero di somministrazioni al giorno e durata totale della cura
Un posto dove annotare ogni dose data, per esempio Animiyo o un calendario condiviso

The most common mistake with an antibiotic is not giving too much, it is stopping too soon. After two or three days the animal seems better, the visible symptoms fade, and the temptation to save the leftover tablets for next time is strong. But improvement is not cure: it means the weakest bacteria have been killed and the toughest, most resistant ones remain, and an interrupted course leaves them free to bounce back stronger than before. Finishing the treatment as prescribed is not overzealous, it is the part of the job that decides whether the cure actually works. This guide does not go into which antibiotic to use or at what dose, which are the vet's decisions alone, but into how not to waste that prescription at home: keeping to the schedule, handling a missed dose without improvising, storing the medicine correctly and recognising when something is wrong.

Why the course must be finished, not abandoned

An antibiotic course has a length calculated to clear the infection completely, not just to make the symptoms disappear. In the first days the most vulnerable bacteria die and the animal improves, but the more stubborn ones are still there. If the course stops at that point, those survivors start multiplying again, often less sensitive to the drug that nearly wiped them out. The result is a relapse that is harder to treat and a contribution to the wider problem of antibiotic resistance, which affects the people in the household too.

Keeping to the time and dose without skipping

An antibiotic works well only if it keeps a reasonably stable concentration in the blood. That is why timing matters almost as much as the dose: twice a day means every twelve hours, not one in the morning and one before bed with a sixteen hour gap in between. Organising the course in advance avoids the last minute rush and doubt.

Read the prescription and turn it into fixed times
Convert phrases like twice a day into two precise times spaced correctly apart, for example eight and eight in the evening. Write them where you see them, do not trust them to memory.
Check whether it goes with food or on an empty stomach
Some antibiotics are given with a meal to ease stomach upset, others away from food because the meal reduces absorption. The leaflet says which: read it before the first dose.
Set a reminder for every administration
A recurring alert in Animiyo or on your phone for each time cuts missed doses to almost nothing, and missed doses are the most frequent cause of a failed course.
Give the whole dose and confirm it was swallowed
With a clever cat or dog the tablet can end up under the sofa or be spat out later. Check the mouth and stay a few minutes: a half given dose is worse than a dose skipped and known to be skipped.
Log the dose as done straight away
Marking each administration the moment it happens is the only way to know for sure, halfway through the day, whether that dose has already been given, above all when several people at home share the task.

What to do if you skip or get a dose wrong

Sooner or later a dose gets missed: you forget, the animal spits it out, you go out without the medicine. The general rule is simple, but the binding reference is always the product leaflet and, if in doubt, a call to the clinic. The table sums up the most common cases.

Indicative response to a missed or mistaken dose. When in doubt, phone the clinic before acting.
Situation	What usually to do	What not to do
You notice shortly after the time	Give the dose as soon as you can and resume the normal rhythm	Do not wait for the next slot out of stubbornness
The next dose is almost due	Skip the missed one and carry on with the next	Do not double up to make up the lost one
The animal spits out or vomits the tablet at once	Call the clinic and ask whether to repeat the dose	Do not re-dose blindly without knowing how much was absorbed
You gave an extra dose by mistake	Tell the vet and watch the animal	Do not hide the error: it changes what to expect

Storing and giving it safely

A badly stored antibiotic loses potency before the printed expiry, and this is especially true of syrups reconstituted with water, which last only a few days. A few precautions keep the medicine effective for the whole course and reduce errors when several medicines are around the house.

Store the medicine as the leaflet says: some syrups go in the fridge, others are light sensitive and stay in the original box.
If the syrup was made up by adding water, write the date and the short new expiry on the pack, often one or two weeks.
Shake the suspension before every dose, so the active ingredient spreads out and the dose is genuinely the one prescribed.
Use the product's own dosing syringe, not a teaspoon: the difference between a correct and a wrong dose passes right through this.
Keep antibiotics away from other medicines and out of reach of pets and children, in a closed, recognisable container.
Do not use leftovers from an earlier course or another animal's medicine: the drug, the dose and the length change from case to case.

Closing the course and spotting problems

The last day of treatment is not always the end of the story. Some infections need a check to confirm they are genuinely resolved, and side effects can appear during the course that must be recognised and reported. Closing the course well matters as much as following it.

Complete every planned dose, even if the animal has been perfectly well for days: that is exactly the point of the course.
Watch for digestive upset, such as diarrhoea or loss of appetite, which are the most common side effects of antibiotics.
Report any reaction that worries you to the vet, without stopping on your own initiative unless they tell you to.
Ask whether an end of course check or a test is needed to confirm the infection is cleared, especially with recurrent infections.
Dispose of leftover medicine properly: antibiotics must not go down the sink or toilet, but back to the pharmacy where take back is provided.

Frequently asked questions

My animal is perfectly fine after three days: can I stop?: No, and this is the single most important point in the guide. Rapid improvement is normal and wanted, but it does not mean the infection has been cleared: it means the weakest bacteria are dead and the more resistant ones remain. Stopping now leaves them free to bounce back, often in a form less sensitive to the drug, and the result is a relapse that is harder to treat. Always complete the number of days prescribed. If you think the course is too long or the drug is upsetting the animal, discuss it with the vet rather than deciding to stop on your own.
I forgot a dose: do I make it up by doubling the next one?: Almost never. The general rule is that if you notice shortly after the time you give the dose at once, whereas if the next one is nearly due you skip the missed one and carry on as normal, never doubling to compensate. Doubling does not speed up recovery and raises the risk of side effects. If you have skipped several doses in a row or do not know how to get back on schedule, call the clinic: it is a common question and they will tell you exactly how to resume without a mess.
Can I hide the tablet in food to get it eaten?: Often yes, with two cautions. The first is that some antibiotics should be given away from meals because food reduces their absorption: check the leaflet or ask the vet. The second is that you must be sure the animal eats the entire portion the tablet is hidden in, otherwise it gets only part of the dose. With a suspicious animal it helps to use a small, tempting treat given whole, and to check it is actually swallowed rather than spat out moments later.
I have tablets left over: do I keep them for next time?: No. Leftover antibiotic should not be kept to self treat a future problem, nor used on another animal. The right drug, dose and length depend on the type of infection, the weight and the species, and using a random leftover risks an inadequate course that worsens resistance. The correct way to handle leftovers is to return them to the pharmacy for disposal. If you have quite a few doses left over, though, it is worth asking whether you really completed the course or stopped it earlier than planned.

What to do next

Turn the prescription into fixed, evenly spaced times, always give the whole dose while checking it is swallowed, and log it straight away. Do not stop at the first improvement and do not double up to recover a missed dose: complete every planned day. Store the medicine as the leaflet says, report any reaction or lack of improvement to the vet, and dispose of leftovers at the pharmacy.