Start with a demonstration, not a guess
Oral medication in reptiles is a hands-on skill, and the safest way to learn it is on your own animal, in the practice, with the person who prescribed it. Ask the vet or nurse to show you the full sequence — how the animal is held, how the mouth is encouraged open, where the syringe tip goes — and then to watch you do it once before you leave. Techniques that suit a bearded dragon do not transfer automatically to a gecko, and snakes are a different proposition again. If anything about the demonstration is unclear, ask then, not at the enclosure that evening. It is also worth asking what counts as a failed attempt in the vet's eyes, and what they want you to do in that case, so the decision is made before you are mid-struggle with a stressed animal.
Lizards: patience around a mouth that clamps
Most lizards resent having their mouths opened, and their jaws and teeth are easier to damage than their stubbornness suggests. Work at the animal's calmest time of day, on a towel at a table, with the body fully supported so the animal feels held rather than grabbed. Follow the vet's demonstrated method exactly — for many lizards that means gentle encouragement at the mouth rather than force, and pausing to let the animal settle between attempts. Never lever a mouth open with anything hard, and never keep escalating pressure on a jaw that stays shut: a fractured jaw or torn mouth tissue turns one treatment into two problems. Give the medication slowly, in the place the vet directed, and give the animal time to swallow before offering more. If the animal gapes, thrashes or blows the medication back out repeatedly, stop for the day and phone the practice for advice.
Snakes: a different set of risks
A snake's teeth angle backwards, its jaw is built to flex around prey rather than resist handling, and a snake that has recently eaten may regurgitate if it is stressed by medication. For those reasons many vets demonstrate a specific approach for the individual snake, sometimes involving a soft speculum or tube they supply, and that demonstration matters even more than with lizards. Support the snake's body along its length, never grip behind the head harder than the vet showed you, and keep sessions short. Watch afterwards that the snake settles and keeps the medication down; repeated regurgitation, wheezing or bubbling at the mouth after medication is a reason to contact the practice promptly, since medication in the airway is a genuine risk in a badly handled session.
When it is not working, stop and ask
The rule that protects the animal is simple: difficulty is information for the vet, not a challenge for you. An animal that cannot be medicated by the demonstrated method may need the medication given another way, a different formulation, or a nurse appointment to have it administered — all decisions for the practice, not improvisations at home. Never change how much you give, how often, or what you mix it with on your own initiative. Keep a note of each session: given fully, partly, refused, or lost, with the time. Those notes tell the vet whether the treatment is actually happening, which matters as much as the treatment itself. KinsLe's Pet Passport keeps the vet's instructions and your session notes in the same packet as the rest of your reptile's records, so the practice can see exactly what has been given when you report back.