Sublabial, literally 'under the lip', from Latin, refers to the pharmacological route of administration by which the active substance is placed between the lip and the gingiva. It is commonly held between the upper lip and gum to avoid swallowed salivation, which permits slow release of drug to prolong the duration of action.

It is usually used for drugs such as Glyceryl trinitrate, for example, in angina pectoris.^[1]

v t e Routes of administration, dosage forms
Oral	Digestive tract (enteral) Solids Tablet Capsule Pastille Time release technology Osmotic delivery system Liquids Decoction Elixir Electuary Emulsion Effervescent powder or tablet Herbal tea Hydrogel Molecular encapsulation Powder Softgel Solution Suspension Syrup Tincture Oral mucosa (buccal, sublabial, sublingual) Solids Orally disintegrating tablet Film Lollipop Sublingual drops Lozenges Effervescent tablet Chewing gum Liquids Mouthwash Toothpaste Ointment Spray Respiratory tract (inhalation) Solids Dry-powder inhaler Smoking 0 0 Liquids Anesthetic vaporizer Heated humidified high-flow therapy Medical inhalants Metered-dose inhaler (MDI) Nebulizer Vaporizer Gas Oxygen mask and Nasal cannula Oxygen concentrator Anaesthetic machine Medical inhalants Relative analgesia machine
Ophthalmic, otic, nasal	Nasal spray Ear drops Eye drops Ointment Hydrogel Insufflation Mucoadhesive microdisc
Urogenital	Ointment Pessary Vaginal ring Douche Intrauterine device (IUD) Extra-amniotic infusion Intravesical infusion
Rectal (enteral)	Ointment Suppository Enema Solution Hydrogel Murphy drip Nutrient enema
Dermal (topical)	Ointment Topical cream Topical gel Liniment Paste Film DMSO solution Iontophoresis Hydrogel Liposomes Transfersome vesicles Cream Lotion Lip balm Medicated shampoo Dermal patch Transdermal patch Transdermal spray Jet injector
Parenterals Injections infusions (into tissue/blood)	Skin (transdermal) Intradermal Subcutaneous Injector pen Transdermal implant Organs Intracavernous Intravitreal Intra-articular Central nervous system Intracerebral Intrathecal Epidural Circulatory, musculoskeletal Intravenous Intracardiac Intramuscular Intraosseous Intraperitoneal Nanocell injection Patient-controlled analgesia pump PIC line

v t e Routes of administration, dosage forms
Oral	Digestive tract (enteral) Solids Tablet Capsule Pastille Time release technology Osmotic delivery system Liquids Decoction Elixir Electuary Emulsion Effervescent powder or tablet Herbal tea Hydrogel Molecular encapsulation Powder Softgel Solution Suspension Syrup Tincture Oral mucosa (buccal, sublabial, sublingual) Solids Orally disintegrating tablet Film Lollipop Sublingual drops Lozenges Effervescent tablet Chewing gum Liquids Mouthwash Toothpaste Ointment Spray Respiratory tract (inhalation) Solids Dry-powder inhaler Smoking 0 0 Liquids Anesthetic vaporizer Heated humidified high-flow therapy Medical inhalants Metered-dose inhaler (MDI) Nebulizer Vaporizer Gas Oxygen mask and Nasal cannula Oxygen concentrator Anaesthetic machine Medical inhalants Relative analgesia machine
Ophthalmic, otic, nasal	Nasal spray Ear drops Eye drops Ointment Hydrogel Insufflation Mucoadhesive microdisc
Urogenital	Ointment Pessary Vaginal ring Douche Intrauterine device (IUD) Extra-amniotic infusion Intravesical infusion
Rectal (enteral)	Ointment Suppository Enema Solution Hydrogel Murphy drip Nutrient enema
Dermal (topical)	Ointment Topical cream Topical gel Liniment Paste Film DMSO solution Iontophoresis Hydrogel Liposomes Transfersome vesicles Cream Lotion Lip balm Medicated shampoo Dermal patch Transdermal patch Transdermal spray Jet injector
Parenterals Injections infusions (into tissue/blood)	Skin (transdermal) Intradermal Subcutaneous Injector pen Transdermal implant Organs Intracavernous Intravitreal Intra-articular Central nervous system Intracerebral Intrathecal Epidural Circulatory, musculoskeletal Intravenous Intracardiac Intramuscular Intraosseous Intraperitoneal Nanocell injection Patient-controlled analgesia pump PIC line