Here you’ll find 30 Medications that start with G, organized from “Gabapentin” to “Guanfacine”. These entries include commonly prescribed generics across fields like neurology, psychiatry, cardiology, and infectious disease. Many have long histories of use and clear safety profiles.
Medications that start with G are drugs whose generic names begin with the letter G. Gabapentin is a notable example, widely used for neuropathic pain worldwide.
Below you’ll find the table with Generic name, Drug class, Common uses, and Common side effects.
Generic name: Primary name for each medication; you use it to search, compare doses, and avoid confusion.
Drug class: Shows the medication’s pharmacologic group so you understand how it works and compares to similar drugs.
Common uses: Lists typical conditions the drug treats so you can quickly see its main clinical purposes.
Common side effects: Summarizes frequent adverse effects to help you anticipate tolerability and discuss concerns with clinicians.
Medications that start with G
| Generic name | Brand names | Drug class | Typical adult dose |
|---|---|---|---|
| Gabapentin | Neurontin; Gralise | Anticonvulsant/neuropathic pain agent | 300–600 mg PO three times daily |
| Gabapentin enacarbil | Horizant | Anticonvulsant prodrug (RLS, neuropathic pain) | 600 mg PO once daily |
| Galantamine | Razadyne | Cholinesterase inhibitor (Alzheimer disease) | 8–24 mg PO daily |
| Ganciclovir | Cytovene | Antiviral (anti‑CMV) | 5 mg/kg IV every 12 hours |
| Gemcitabine | Gemzar | Antimetabolite chemotherapy | 1,000 mg/m2 IV weekly |
| Gemfibrozil | Lopid | Fibrate lipid‑lowering agent | 600 mg PO twice daily |
| Gentamicin | Garamycin | Aminoglycoside antibiotic | 5 mg/kg IV once daily |
| Gemtuzumab ozogamicin | Mylotarg | Antibody–drug conjugate (AML) | 3 mg/m2 IV (varies by regimen) |
| Gefitinib | Iressa | EGFR tyrosine kinase inhibitor (oncology) | 250 mg PO once daily |
| Gadobutrol | Gadavist | Gadolinium MRI contrast agent | 0.1 mmol/kg IV |
| Gadoteridol | ProHance | Gadolinium MRI contrast agent | 0.1 mmol/kg IV |
| Gadoterate meglumine | Dotarem | Gadolinium MRI contrast agent | 0.1 mmol/kg IV |
| Gadopentetate dimeglumine | Magnevist | Gadolinium MRI contrast agent | 0.1 mmol/kg IV |
| Glatiramer acetate | Copaxone; Glatopa | Immunomodulator for multiple sclerosis | 20 mg SC daily |
| Glimepiride | Amaryl | Sulfonylurea (antidiabetic) | 1–4 mg PO once daily |
| Glipizide | Glucotrol | Sulfonylurea (antidiabetic) | 5–10 mg PO once daily |
| Glyburide | Diabeta; Glynase | Sulfonylurea (antidiabetic) | 2.5–10 mg PO once daily |
| Gliclazide | Diamicron | Sulfonylurea (antidiabetic) | 30–120 mg PO daily |
| Glucagon | GlucaGen | Hypoglycemia rescue hormone | 1 mg IM/SC/IV once |
| Granisetron | Kytril; Sancuso | 5‑HT3 receptor antagonist antiemetic | 1–3 mg IV or 2 mg PO once |
| Golimumab | Simponi | TNF‑alpha inhibitor biologic | 50 mg SC every month |
| Goserelin | Zoladex | GnRH agonist (hormone therapy) | 3.6 mg SC depot monthly |
| Griseofulvin | Grifulvin V | Oral antifungal | 500–1,000 mg PO daily |
| Guanfacine | Tenex; Intuniv | Alpha‑2 adrenergic agonist (ADHD/HTN) | 1–4 mg PO once daily |
| Guaifenesin | Mucinex; Robitussin | Expectorant (OTC) | 200–400 mg PO every 4 hours |
| Gallium nitrate | Ganite | Antineoplastic/anti‑hypercalcemia agent | 200 mg/m2 IV daily (varies) |
| Glycopyrrolate | Robinul | Antimuscarinic (preop, sialorrhea) | 0.2–0.4 mg IV once |
| Gonadorelin | Factrel | Gonadotropin‑releasing hormone (diagnostic/therapeutic) | 100 mcg IV bolus (varies) |
| Glyceryl trinitrate | Nitrolingual; Nitro‑Dur | Nitrate vasodilator for angina | 0.3–0.6 mg SL as needed |
| Glucarpidase | Voraxaze | Enzyme for methotrexate toxicity | 50 U/kg IV once |
Descriptions
Gabapentin
Used for seizures and nerve pain such as postherpetic neuralgia; commonly causes drowsiness or dizziness.
Gabapentin enacarbil
Prodrug of gabapentin used for restless legs and some nerve pain; may cause sleepiness and leg swelling.
Galantamine
Used to help thinking in mild–moderate Alzheimer’s; can cause nausea and vomiting.
Ganciclovir
Treats cytomegalovirus infections, especially in immunocompromised patients; may cause low blood counts.
Gemcitabine
Chemotherapy for several cancers; common side effects include low blood counts and fatigue.
Gemfibrozil
Lowers triglycerides and raises HDL; may cause stomach upset and increase muscle risk with statins.
Gentamicin
Used for serious Gram‑negative infections; risk of kidney injury and hearing loss.
Gemtuzumab ozogamicin
Targeted treatment for acute myeloid leukemia; can cause liver injury and low blood counts.
Gefitinib
Oral targeted therapy for certain lung cancers with EGFR mutations; may cause rash and diarrhea.
Gadobutrol
Contrast agent for enhanced MRI scans; rare kidney concerns and allergic reactions possible.
Gadoteridol
MRI contrast used to improve imaging detail; can rarely affect kidney function or cause allergic reactions.
Gadoterate meglumine
Used for enhanced MRI imaging; generally well tolerated but allergic reactions can occur.
Gadopentetate dimeglumine
Older MRI contrast agent; may rarely affect kidney function or trigger allergic reactions.
Glatiramer acetate
Reduces relapse rates in multiple sclerosis; may cause injection‑site reactions and transient flushing.
Glimepiride
Lowers blood sugar in type 2 diabetes; can cause low blood sugar (hypoglycemia) and weight gain.
Glipizide
Used for type 2 diabetes to reduce glucose; risk of hypoglycemia and dizziness.
Glyburide
Treats type 2 diabetes; has higher hypoglycemia risk, especially in older adults.
Gliclazide
Common antidiabetic in many countries; may cause low blood sugar and weight gain.
Glucagon
Emergency treatment for severe low blood sugar; can cause nausea and vomiting.
Granisetron
Prevents nausea and vomiting from chemotherapy or surgery; common side effect is headache or constipation.
Golimumab
Treats rheumatoid arthritis and related conditions; increases risk of infection and TB reactivation.
Goserelin
Used for prostate and breast cancer and other hormone‑dependent conditions; may cause hot flashes and bone loss.
Griseofulvin
Treats certain fungal infections of skin, hair and nails; can cause dizziness and liver enzyme changes.
Guanfacine
Used for ADHD and sometimes high blood pressure; can cause drowsiness and low blood pressure.
Guaifenesin
Helps loosen chest mucus in coughs; may cause stomach upset or dizziness.
Gallium nitrate
Used for severe hypercalcemia of malignancy and some cancer uses; can affect kidneys and blood counts.
Glycopyrrolate
Reduces secretions and treats some GI spasms; may cause dry mouth and blurred vision.
Gonadorelin
Used to test or stimulate pituitary‑gonadal function; can cause hormonal side effects and injection reactions.
Glyceryl trinitrate
Sublingual nitroglycerin for acute angina; often causes headache and lightheadedness.
Glucarpidase
Rapidly lowers toxic methotrexate levels in overdose; can cause allergic reactions and raise uric acid.