CyclobenzaprineCyclobenzaprine Hydrochloride

About Cyclobenzaprine

The label says cyclobenzaprine relieves muscle spasm of local origin without interfering with muscle function. Tablets and extended-release capsules are labeled as an adjunct to rest and physical therapy for muscle spasm from acute, painful musculoskeletal conditions, for no more than two or three weeks, because evidence of effectiveness for longer use is not available; they have not been found effective for spasticity from brain or spinal cord disease or in children with cerebral palsy. Tablets usually start at 5 mg three times a day and may rise to 10 mg three times a day; older adults and people with mild liver impairment start at 5 mg and increase slowly, and use with moderate or severe liver impairment is not recommended. Capsules are taken as 15 mg once a day, up to 30 mg, and are not recommended for older adults or with any liver impairment. Tablet safety and effectiveness under age 15 are not established.

There is no boxed warning. Cyclobenzaprine must not be taken with an MAO inhibitor or within 14 days of stopping one, in the recovery phase after a heart attack, with an abnormal heart rhythm, heart block, conduction disturbances or heart failure, with an overactive thyroid, or by anyone allergic to it. Serotonin syndrome, which can be life-threatening, has been reported when it is combined with other serotonergic drugs; agitation, fever, sweating, a fast heartbeat, shivering, or severe muscle stiffness or twitching needs prompt medical attention. It is structurally related to tricyclic antidepressants, which have been reported to cause abnormal heart rhythms, heart attack and stroke, and its atropine-like action calls for caution with urinary retention, angle-closure glaucoma or raised eye pressure. It can impair driving and adds to the effects of alcohol and other sedatives. Drowsiness, dry mouth and dizziness are among the most common side effects.

Fexmid is a 7.5 mg tablet with a brand name, approved as a generic. Tonmya, approved in August 2025, is a 2.8 mg tablet placed under the tongue at bedtime, two tablets from day 15 (one for people 65 or older or with mild liver impairment; not recommended with moderate or severe liver impairment). Mouth numbness or discomfort, an abnormal taste and sleepiness are its most common side effects. The tablet labels say to use cyclobenzaprine in pregnancy only if clearly needed, and the Amrix label says case reports have not identified a drug-associated risk; the Tonmya label, citing neural tube defects in a rabbit study, calls for a pregnancy test first, avoiding it from two weeks before conception through the first trimester, and effective contraception during treatment and for two weeks after.

Taking Cyclobenzaprine

How to take it

Tablets usually three times a day and capsules once a day at about the same time, with or without food. Swallow capsules whole, or sprinkle the contents on a tablespoon of applesauce and swallow at once without chewing. Let Tonmya dissolve under the tongue at bedtime after moistening your mouth with water, without swallowing, cutting, crushing or chewing it, then do not eat or drink for 15 minutes.

If you miss a dose

Take a missed tablet or capsule as soon as you remember, unless it is almost time for the next dose; then skip it. Do not double up. If a Tonmya bedtime dose is missed, take the next one the following evening, never during the day.

Storage

At room temperature in the original, tightly closed container, away from excess heat and moisture, out of reach of children; keep extended-release capsules away from light. Keep Tonmya in its bottle with the desiccant canister.

Interactions to know about

Never with an MAO inhibitor or within 14 days of one. SSRIs, SNRIs, tricyclic antidepressants, tramadol, bupropion, meperidine and verapamil add to the risk of serotonin syndrome, and it may raise the seizure risk with tramadol. Alcohol, barbiturates and other sedatives add to its effects, and it may block the blood pressure effect of guanethidine.

This summarizes the official prescribing information. Your prescriber’s and pharmacist’s instructions, and the leaflet that comes with your medicine, take priority.

Why the cash price for Cyclobenzaprine differs from pharmacy to pharmacy

Generic 5 and 10 mg tablets have many makers and the 7.5 mg tablet fewer, and a prescription for Fexmid that blocks substitution must be filled with Fexmid. Courses are short, so the quote depends on the quantity written.

A prescription naming Amrix that blocks substitution, like one for Tonmya, is priced as a brand, and no form can be exchanged for another.

Ways to pay less for Cyclobenzaprine without insurance

• Ask for generic tablets, check that the prescription does not block substitution, and compare more than one pharmacy.
• If extended-release capsules are prescribed, ask for the generic capsule, or ask the prescriber whether tablets would suit you.
• Ask the prescriber how many days you need it, so the quantity matches a short course.
• If Tonmya is prescribed, ask the maker whether a savings program applies to cash payers.
• Upload the prescription to Script Unlock so licensed pharmacies can quote their cash price. You pay the pharmacy directly.

Questions to ask your pharmacist about Cyclobenzaprine

1. 1.Which form is my prescription for, and can it be swapped for another?
2. 2.Is it safe with my antidepressant, migraine medicine, tramadol or other pain medicine?
3. 3.Can I drive or drink alcohol while I take it?
4. 4.What if my muscle pain lasts longer than three weeks?

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