Adverse effects · Symptom escalation
Tadalafil Side Effects: Common, Serious, and Urgent
Headache, indigestion, back pain, muscle aches, nasal congestion, flushing, and limb pain are among tadalafil’s common labeled adverse reactions. Priapism, sudden vision loss, sudden hearing change, and dangerous cardiovascular symptoms belong in a different urgency category.
Medically reviewed by
Urology · Sexual medicine · Erectile dysfunction
Medical review completed August 27, 2026
Use Severity and Context, Not Just a Symptom List
| Level | Examples | What to do |
|---|---|---|
| Monitor and report if persistent | Headache, indigestion, nasal congestion, flushing, mild back or muscle pain | Record timing and severity; ask the prescriber or pharmacist if troublesome or recurrent |
| Prompt clinical contact | Marked dizziness, repeated near-fainting, severe persistent pain, concerning rash, or worsening symptoms | Contact a clinician promptly and avoid self-directed dose changes |
| Immediate emergency treatment | Erection lasting more than four hours, chest pain, collapse, or severe breathing difficulty | Use emergency services; disclose tadalafil use and the last dose time |
| Stop and seek medical attention | Sudden loss of vision; sudden decrease or loss of hearing | Follow label instructions without waiting for a routine appointment |
Severity changes meaning. Mild flushing that resolves is different from fainting. A familiar headache is different from a sudden severe headache with neurologic symptoms. Back discomfort that begins after tadalafil can be a labeled effect, but pain after injury or with weakness, numbness, fever, or urinary symptoms needs a broader assessment.
Why Common Tadalafil Effects Happen
Vasodilation
Blood-vessel effects can contribute to headache, flushing, nasal congestion, dizziness, and blood-pressure symptoms.
Digestive effects
Dyspepsia or reflux-like discomfort can occur. Severe abdominal or chest symptoms should not be assumed to be indigestion.
Muscle and back symptoms
Back pain and myalgia are labeled reactions and may appear later than headache or flushing.
Track when the symptom began relative to the prescribed dose, when it ended, whether it recurred, what other medicines or alcohol were present, and what relieved or worsened it. This record helps distinguish a reproducible adverse effect from another illness.
Priapism Is About Duration, Not Just Pain
An erection lasting more than four hours needs emergency treatment, whether or not it is painful. Waiting can damage erectile tissue. Do not try to solve it with cold showers, exercise, alcohol, another medicine, or internet remedies. Tell emergency clinicians what was taken and when.
Vision and Hearing Changes Need Fast Action
The Cialis label instructs patients to stop tadalafil and seek medical attention for sudden loss of vision in one or both eyes. Sudden decrease or loss of hearing needs prompt medical attention and may occur with ringing in the ears or dizziness. These events are uncommon, but rarity does not justify waiting.
Report previous non-arteritic anterior ischemic optic neuropathy, major eye disease, sudden hearing loss, or significant hearing conditions before treatment. A clinician weighs the history and alternatives; a website cannot calculate a personal risk from one checkbox.
Chest Symptoms and the Nitrate Problem
Tadalafil is contraindicated with nitrates because it can amplify blood-pressure lowering. If chest symptoms occur after tadalafil, call emergency services and tell responders when it was used. Do not self-administer nitroglycerin. The fact that tadalafil’s erectile benefit seems to have ended does not safely establish that the interaction risk is over.
Dizziness and fainting can also be worsened by alpha-blockers, antihypertensives, dehydration, and substantial alcohol. Review the combination rather than assuming the tadalafil tablet alone explains everything.
What Not to Do With a Side Effect
Do not take another dose to “test” whether the symptom was real. Do not split or change tablets, alternate daily and as-needed regimens, or add sildenafil without prescriber instructions. Do not stop essential heart or blood-pressure treatment to preserve access to tadalafil. The correct response may be a regimen review, another treatment, or assessment of a separate medical problem.
For nonurgent effects, the prescriber may review the timing, regimen, other medicines, alcohol, hydration, and whether benefits outweigh burden. A pharmacist can verify the dispensed product and help identify interactions. Suspected reactions can be reported to FDA MedWatch, but reporting is not a substitute for medical care.
Before the follow-up call, write down the symptom in the patient’s own words, when it began, how long it lasted, whether it limited walking, driving, sleep, eating, or sexual activity, and what other medicines or alcohol were used that day. Include the exact tadalafil regimen from the pharmacy label rather than relying on tablet color or memory. This short record helps the prescriber separate a tolerable recurring effect from a new interaction or an unrelated problem that needs its own evaluation.
Also report whether the same symptom occurred before tadalafil, returned after more than one prescribed dose, or appeared only after another medicine was started. Bring photographs of every pharmacy label and supplement panel when names are uncertain. The log is evidence for a clinician, not permission to repeat a dose that caused a severe reaction. New weakness, confusion, fainting, breathing difficulty, chest symptoms, or rapidly worsening illness should be assessed according to urgency rather than held for a scheduled follow-up.
Side-Effect Questions
Is back pain after tadalafil normal?
Back pain is a labeled common adverse reaction. Contact the prescriber if it is severe, persistent, recurrent, or accompanied by weakness, numbness, fever, injury, or urinary symptoms.
When is dizziness concerning?
Repeated near-fainting, actual fainting, chest symptoms, or dizziness after alcohol or blood-pressure medicines deserves prompt assessment. Use emergency services for collapse or immediate danger.
Should tadalafil be stopped for sudden vision change?
The label says to stop tadalafil and seek medical attention for sudden loss of vision in one or both eyes.
Can a side effect be reported to FDA?
Yes, suspected adverse events can be reported through MedWatch. Contact the prescriber for care advice and use emergency services when symptoms are urgent.