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Drugs A to Z
Select any letter to display the medications available then choose one to learn more about the side effects, dosing, interactions and the most important information about its use.
R
Rabeprazole decreases the amount of acid produced in the stomach.
Rabies is a serious disease caused by a virus. Rabies is mainly a disease of animals.
Humans get rabies when they are bitten by an infected animal. There may be no symptoms at
first, but weeks or even years after a bite from an infected animal, rabies can cause pain, fatigue,
headaches, irritability, fever, seizures, hallucinations, and paralysis. Rabies can be fatal.
Rabies is a serious disease caused by a virus. Rabies is mainly a disease of animals.
Humans get rabies when they are bitten by an infected animal. There may be no symptoms at
first, but weeks or even years after a bite from an infected animal, rabies can cause pain, fatigue,
headaches, irritability, fever, seizures, hallucinations, and paralysis. Rabies can be fatal.
Rabies is a serious disease caused by a virus. Rabies is mainly a disease of animals.
Humans get rabies when they are bitten by an infected animal. There may be no symptoms at
first, but weeks or even years after a bite from an infected animal, rabies can cause pain, fatigue,
headaches, irritability, fever, seizures, hallucinations, and paralysis. Rabies can be fatal.
Raloxifene affects the cycle of bone formation and breakdown in the body, and reduces
loss of bone tissue.
Raltegravir is an antiviral medication that prevents human immunodeficiency virus (HIV)
cells from multiplying in your body.
Ramelteon is a sedative, also called a hypnotic. It works by affecting certain substances
in your body that help regulate your "sleep-wake cycle."
Ramipril is in a group of drugs called ACE inhibitors. ACE stands for angiotensin
converting enzyme.
Ranibizumab is made from a human antibody fragment. It works by keeping new blood
vessels from forming under the retina (a sensory membrane that lines the inside of the eye). In
people with a certain type of eye disease, new blood vessels grow under the retina where they
leak blood and fluid. This is known as the "wet form" of macular degeneration.
Ranitidine bismuth citrate was withdrawn from the U.S. market in 1998.
Ranitidine is in a group of drugs called histamine-2 blockers. Ranitidine works by
reducing the amount of acid your stomach produces.
Ranolazine is an anti-anginal medication. It works by improving blood flow to help the
heart work more efficiently.
Rasagiline is a monoamine oxidase-B (MAO-B) inhibitor. It works by increasing the
levels of certain chemicals in the brain.
Rasburicase increases the rate at which uric acid is broken down in the body.
Red yeast rice is a product of yeast that is grown on rice. It is marketed as Cholestin,
Monascus, Zhi Tai, hong qu, red koji, red rice, Xue Zhi Kang, and others.
Remifentanil is a narcotic (opioid) pain medicine.
Repaglinide is an oral diabetes medicine that helps control blood sugar levels. This
medication lowers blood sugar by causing the pancreas to produce insulin.
Reserpine lowers blood pressure by decreasing the levels of certain chemicals in your
blood. This allows your blood vessels (veins and arteries) to relax (widen) and your heart to beat
more slowly and easily.
Resorcinol topical (for the skin) works by breaking down rough, scaly, or hardened skin.
Respiratory syncytial virus immune globulin (RSV IG) is a sterilized solution obtained from
pooled human blood. It contains the immunoglobulins (or antibodies) to protect against infection from
respiratory syncytial virus (RSV), a virus that can cause serious illness in children. Antibodies are
substances in the blood that fight infections.
Retapamulin is a topical (applied to the skin) antibiotic that fights bacteria on the skin.
Retaplase is a thrombolytic (THROM-bo-LIT-ik) drug that is used to dissolve blood clots.
Rho(D) immune globulin (Rho(D) IG) is a sterilized solution made from human blood.
Rh is a substance that most people have in their blood (Rh positive) but some people don't (Rh
negative). A person who is Rh negative can be exposed to Rh positive blood through a
mismatched blood transfusion or during pregnancy when the baby has the opposite blood type.
When this exposure happens, the Rh negative blood will respond by making antibodies that will
try to destroy the Rh positive blood cells. This can cause medical problems such as anemia (loss
of red blood cells), kidney failure, or shock.
Ribavirin is an antiviral medication.
Riboflavin is vitamin B2. Vitamins are naturally occurring substances necessary for
many processes in the body. Riboflavin is important in the maintenance of many tissues of
the body.
Rifabutin is an antibiotic. It prevents bacteria from multiplying in your body.
Rifampin is an antibiotic. Rifampin prevents bacteria from spreading in your body.
Rifapentine is an antibiotic. It prevents bacteria from multiplying in your body.
Rifaximin is an antibiotic that fights bacterial infection only in the intestines. It is used to
treat travelers' diarrhea caused by E. coli. Most people get this infection by eating food or
drinking fluids that have been contaminated with the bacteria.
Riluzole affects muscles and nerves in the body. The exact way that it works is unknown.
Rimantadine is an antiviral medication. It blocks the actions of viruses in your body.
Rimexolone ophthalmic is in a class of drugs called corticosteroids. It inhibits processes
in the body that cause inflammation. Therefore, the swelling and pain of inflammatory conditions
is decreased.
Risedronate is in a group of medicines called bisphosphonates (bis FOS fo nayts). It
alters the cycle of bone formation and breakdown in the body. Risedronate slows bone loss
while increasing bone mass, which may prevent bone fractures.
Risperidone is an antipsychotic medication. It works by changing the effects of chemicals
in the brain.
Ritonavir is an antiviral medication in a group of HIV medicines called protease
(PRO-tee-ayz) inhibitors. Ritonavir prevents human immunodeficiency virus (HIV) cells from
multiplying in your body.
Rituximab is a cancer medication that interferes with the growth of cancer cells and slows
their growth and spread in the body.
Rivastigmine improves the function of nerve cells in the brain. It works by preventing the
breakdown of a chemical called acetylcholine (ah see til KO leen). People with dementia usually
have lower levels of this chemical, which is important for the processes of memory, thinking, and
reasoning.
Rizatriptan is a headache medicine. It is believed to work by narrowing the blood vessels
around the brain. Rizatriptan also reduces substances in the body that can trigger headache pain,
nausea, sensitivity to light and sound, and other migraine symptoms.
Rocuronium is used to relax the muscles. It works by blocking the signals between your
nerves and your muscles.
Rofecoxib (Vioxx) was withdrawn from the U.S. market in 2004.
Ropinirole has some of the same effects as a chemical called dopamine, which occurs
naturally in your body. Low levels of dopamine in the brain are associated with Parkinson's
disease.
Ropivacaine is an anesthetic (numbing medicine) that blocks the nerve impulses that send
pain signals to your brain.
Rosiglitazone is an oral diabetes medicine that helps control blood sugar levels.
Rosuvastatin is a cholesterol-lowering medication that blocks the production of
cholesterol (a type of fat) in the body. It works by reducing levels of "bad" cholesterol
(low-density lipoprotein, or LDL) and triglycerides in the blood, while increasing levels of
"good" cholesterol (high-density lipoprotein, or HDL).
Rotavirus vaccine contains five strains of rotavirus. It is made from both human and animal
sources.
Rotigotine has some of the same effects as a chemical called dopamine, which occurs
naturally in your body. Low levels of dopamine in the brain are associated with Parkinson's
disease.
The use of raspberry in cultural and traditional settings may differ from concepts accepted by
current Western medicine. When considering the use of herbal supplements, consultation with a primary
health care professional is advisable. Additionally, consultation with a practitioner trained in the uses of
herbal/health supplements may be beneficial, and coordination of treatment among all health care
providers involved may be advantageous.
Rivastigmine improves the function of nerve cells in the brain. It works by preventing the
breakdown of a chemical called acetylcholine (ah see til KO leen). People with dementia usually
have lower levels of this chemical, which is important for the processes of memory, thinking, and
reasoning.
N/A
Risperidone is an antipsychotic medication. It works by changing the effects of chemicals
in the brain.
Ropinirole has some of the same effects as a chemical called dopamine, which occurs
naturally in your body. Low levels of dopamine in the brain are associated with Parkinson's
disease.
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