Sublingual and Buccal Medications: How to Use Them Correctly
A step-by-step patient guide to sublingual and buccal medication administration, including why these routes are used, how to use them correctly, common examples prescribed after procedures, and important precautions.
What These Routes Mean and Why They Are Used
Sublingual (sub-LIN-gwal) means under the tongue. Buccal (BUK-ul) means between the cheek and gum. Both routes allow the medication to absorb directly into small blood vessels and reach the bloodstream quickly, bypassing the digestive system.
Bypassing digestion matters for drugs that are broken down heavily by the stomach or liver before they can take effect. The sublingual and buccal routes deliver more of the active drug to the bloodstream per dose compared to swallowing.
Onset of action is typically faster than oral tablets: most sublingual medications begin working within 5 to 15 minutes, compared to 30 to 60 minutes for swallowed pills.
Sublingual administration is used for nitroglycerin (chest pain), buprenorphine (pain management and opioid treatment), fentanyl (breakthrough cancer pain), and some hormone therapies.
Buccal administration is used for certain formulations of fentanyl, testosterone, and misoprostol. The cheek's inner surface has a large surface area and steady blood supply for reliable absorption.
How to Use Sublingual and Buccal Medications Correctly
For sublingual tablets or films: lift your tongue, place the tablet or film under the tongue as far back as comfortable, lower your tongue, and keep your mouth closed. Do not chew or swallow the tablet.
For buccal tablets: place the tablet between your upper gum and cheek on one side. Allow it to dissolve naturally. Do not push it with your tongue or chew it.
Allow the medication to dissolve completely. This takes 5 to 15 minutes for most sublingual tablets and up to 30 minutes for some buccal formulations.
Do not eat, drink, smoke, or use mouthwash for at least 15 minutes after placing the medication, as swallowing saliva loaded with medication is fine, but food or liquid can flush the drug away before it is fully absorbed.
If you feel increased saliva building up while the tablet dissolves, swallow normally. Saliva that has been in contact with the dissolving tablet still contains active drug and contributes to absorption.
Common Medications Prescribed This Way During Recovery
Buprenorphine (Subutex, Suboxone) is prescribed sublingually for opioid use disorder treatment and increasingly for post-surgical pain. It is available as a tablet or film that dissolves under the tongue. Never crush or swallow these formulations.
Nitroglycerin sublingual tablets are used for acute chest pain (angina). If prescribed, sit or lie down before using, place the tablet under the tongue, and call 911 if chest pain is not relieved within 5 minutes or after 3 doses 5 minutes apart.
Lorazepam (Ativan) is sometimes prescribed sublingually for acute anxiety or nausea in post-operative settings. It dissolves quickly and works within 15 to 20 minutes.
Misoprostol placed buccally or vaginally is used after certain gynecologic procedures to control bleeding or manage early pregnancy loss. Your provider will specify the placement site, dose, and frequency.
Some anti-nausea medications, including promethazine compounded into sublingual preparations, are used when patients cannot take oral medications due to vomiting after surgery.
Precautions and Storage
Sublingual and buccal medications are typically more potent by this route than the same drug taken orally. Never take a higher dose than prescribed, and never use someone else's prescription.
Dry mouth reduces absorption. If you have significant dry mouth (a common side effect of many post-surgical medications), rinse with a small sip of water and spit before placing the tablet, but do not apply water immediately after placing it.
Store sublingual tablets at room temperature in their original container unless otherwise directed. Nitroglycerin in particular degrades when exposed to heat, light, or air. Keep it in the dark glass bottle it comes in.
Oral hygiene matters. Mouth sores, infections, or significant inflammation can impair absorption and increase irritation at the administration site. Tell your prescriber if you have significant mouth pain or sores.
Do not split, crush, or alter sublingual or buccal tablets unless specifically told to by your pharmacist. Many are formulated for controlled dissolution, and altering them can release too much drug at once.
Frequently asked
Questions patients ask.
What happens if I accidentally swallow a sublingual tablet?
It depends on the drug. For most sublingual medications, swallowing the tablet simply reduces its effectiveness because the drug undergoes significant first-pass metabolism in the liver, meaning less of it reaches the bloodstream. For buprenorphine, swallowing instead of placing it sublingually dramatically reduces its effect. It is unlikely to be dangerous in a one-time situation, but try to remember the correct technique for your next dose and let your prescriber know if you consistently have trouble with the sublingual route.
Why does the tablet sting or taste bitter under my tongue?
Many sublingual tablets are formulated with excipients that can cause a mild burning or bitter taste as they dissolve. This is normal. If discomfort is severe or accompanied by swelling or pain in the mouth, stop using the medication and contact your prescriber. Persistent stinging may occasionally indicate sensitivity to one of the tablet's inactive ingredients.
Can I use sublingual medications if I have dental work or mouth stitches?
Check with your prescriber or surgeon first. Depending on where the dental work or stitches are located, you may still be able to place the medication on the other side of your mouth or under your tongue without disturbing the surgical site. In some cases, your provider may switch you to a different formulation or administration route temporarily.
How do I know if the medication was absorbed correctly?
For most sublingual medications, you will notice the onset of effect within the expected timeframe: 5 to 15 minutes for pain medications, 3 to 5 minutes for nitroglycerin, and 15 to 20 minutes for anxiolytics. If the expected effect does not occur, the tablet may not have fully dissolved or may have been inadvertently swallowed too soon. Document the situation and contact your prescriber for guidance before taking an additional dose.
For patients
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This guide provides general information. For instructions tailored to your specific procedure, ask your provider about QR Rx care plans.
These medication guides are for educational purposes only and do not replace medical advice. Always follow your healthcare provider's specific medication instructions.
