Tizanidine: Side Effects, Uses & Monitoring
Tizanidine tablets are a short-acting drug for the management of spasticity.
- Data source
- FDA labeling via NIH DailyMed (label 5a42267f…)
- Label version
- current
- Last reviewed
- 2026
Reported adverse reactions
Reactions listed in current FDA labeling, with the highest frequency reported across summarized placebo-controlled trials.
| Adverse reaction (as reported in labeling) | Reported frequency* |
|---|---|
| Asthenia * | 78% |
| Dry mouth | 49% |
| Somnolence | 48% |
| Asthenia* | 41% |
| Hypotension | 33% |
| Dizziness | 16% |
| Uti | 10% |
| Bradycardia | 10% |
| Infection | 6% |
| Constipation | 4% |
| Liver function tests abnormal | 3% |
| Vomiting | 3% |
| Speech disorder | 3% |
| Amblyopia (blurred vision) | 3% |
| Urinary frequency | 3% |
| Flu symptom | 3% |
| Sgpt/alt increased | 3% |
| Dyskinesia | 3% |
| Nervousness | 3% |
| Pharyngitis | 3% |
*Highest percentage reported for the active moiety across placebo-controlled trial tables in current FDA labeling. Values reflect trial reporting, not your individual risk.
Labeled uses (from FDA prescribing information)
Tizanidine tablets are a short-acting drug for the management of spasticity. Because of the short duration of effect, treatment with tizanidine should be reserved for those daily activities and times when relief of spasticity is most important (see DOSAGE AND ADMINISTRATION ).
Frequently Asked Questions
What is Tizanidine used for?
FDA labeling lists the approved uses shown above under "Labeled uses." This summary is informational; only a qualified prescriber can determine whether a medication is appropriate for you.
What are the most commonly reported side effects of Tizanidine?
The table above shows adverse reactions and the highest frequencies reported in placebo-controlled trials summarized in current FDA labeling for Tizanidine. Individual risk varies.
Does Tizanidine require lab monitoring?
Monitoring needs vary. Ask your healthcare provider whether any lab tests apply while taking Tizanidine.
Where does this information come from?
All clinical facts on this page were extracted from the current FDA-registered product labeling for this ingredient, published by manufacturers through NIH DailyMed. See the source link below.
Medical disclaimer: Educational content extracted from public FDA labeling. Not medical advice. Always consult a qualified healthcare professional before starting, stopping, or changing any medication.