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Flexeril®
(cyclobenzaprine HCl) Tablets
Also see:
Allegra
Carisoprodol
Clarinex Claritin
D Cyclobenzaprine Flextra
DS
Skelaxin Soma
Zanaflex
Clarinex-D Claritin
Crixivan
Drug Uses
Flexeril is a muscle relaxant, used to treat the pain and
stiffness of muscle injuries, including strains, sprains and muscle spasms. The
active ingredient in Flexeril is cyclobenzaprine.
How Taken
Flexeril comes in 10 mg tablets, and the normal dose in
adults is one 10 mg tablet three times daily. You should not exceed a total
dosage of 60 mg of Flexeril per day. It might be taken with food if stomach
upset occurs. Take Flexeril as directed. Do not increase your dose or take it
more often than prescribed.
Warnings/Precautions
Flexeril may not be suitable for all individuals. If you
have had any of the following conditions in the past, or are being treated for
them now, please inform your doctor. In some cases side effects may be minimized
by following your doctor's advice, but you may be advised not to take Flexeril.
Before taking this drug, tell your doctor if you have: glaucoma, an overactive
thyroid gland, heart disease, difficulty urinating or any allergies. Inform your
doctor if you are pregnant or breast-feeding before taking this drug.
Missed Dose
Take the missed dose as soon as you remember it. However,
if it is almost time for the next dose, skip the missed dose and continue your
regular dosing schedule. Do not take a double dose to make up for a missed one.
Possible Side Effects
May cause stomach upset, heartburn, constipation,
headache, dizziness or drowsiness or dry mouth the first few days as your body
adjusts to the medication. If these symptoms persist or become severe, notify
your doctor. Inform your doctor if you develop: muscle stiffness, skin rash,
itching, rapid heart rate, swelling of the face, difficulty urinating. When
rising quickly from a sitting or lying position, dizziness or lightheadedness
may occur. Change positions slowly and use caution on stairs. Avoid activities
requiring alertness if dizziness or drowsiness occurs. If you notice other
effects not listed above, contact your doctor or pharmacist.
Storage
Store at 25°C (77°F); excursions permitted to 15-30°C
(59-86°F) and out of reach of children.
Overdose
The following symptoms indicate an overdose, get medical
help immediately: difficulty breathing, extreme nervousness or restlessness,
flushed skin, hallucination, racing or irregular heartbeat, seizure, shortness
of breath, tiredness (extreme), unstable temperature, unusual muscle stiffness,
vomiting (in combination with these other symptoms).
More Information
Flexeril may enhance the effects of alcohol, barbiturates,
and other CNS depressants.
Cyclobenzaprine hydrochloride is a white, crystalline tricyclic amine salt with
the empirical formula C20H21N•HCl and a molecular weight of 311.9. It has a
melting point of 217°C, and a pKa of 8.47 at 25°C. It is freely soluble in water
and alcohol, sparingly soluble in isopropanol, and insoluble in hydrocarbon
solvents. If aqueous solutions are made alkaline, the free base separates.
Cyclobenzaprine HCl is designated chemically as
3-(5H-dibenzo[a,d] cyclohepten-5-ylidene)-N,
N-dimethyl-1-propanamine hydrochloride.
FLEXERIL 5 mg (Cyclobenzaprine HCl) is supplied as a 5 mg tablet for oral
administration. FLEXERIL 10 mg (Cyclobenzaprine HCl) is supplied as a 10 mg
tablet for oral administration.
FLEXERIL tablets contain the following inactive ingredients: hydroxypropyl
cellulose, hydroxypropyl methylcellulose, iron oxide, lactose, magnesium
stearate, starch, and titanium dioxide. FLEXERIL 5 mg tablets also contain
Yellow D&C #10 Aluminum Lake HT, and Yellow FD&C #6 Aluminum Lake.
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