Good
Mostly Aligned
Patient Risk:
Moderate
Summary
Most claims (indications, once-daily timing, nitrate/GC stimulator contraindication, priapism, NAION/sudden vision loss, sudden hearing loss, alcohol cautions, alpha-blocker cautions, and key adverse effects in Table 1) are supported by the provided label excerpts. However, several interaction and counseling claims are either unsupported or overstated (notably 'poppers' recreational use and some specific drug class examples such as 'some antifungals/antibiotics' and 'certain HIV medicines' without label support).
Category Scores
Accurate Statements
Cialis (tadalafil) is indicated for the treatment of erectile dysfunction (ED).
Label Indications (Section 1): “CIALIS is indicated for the treatment of erectile dysfunction (ED).”
Cialis (tadalafil) is indicated for the treatment of the signs and symptoms of benign prostatic hyperplasia (BPH).
Label Indications (Section 1): “CIALIS is indicated for the treatment of the signs and symptoms of benign prostatic hyperplasia (BPH).”
Daily Cialis (once daily use for ED) is taken at approximately the same time every day, without regard to timing of sexual activity.
Label Dosage/Administration (Section 2.2): “taken at approximately the same time every day, without regard to timing of sexual activity.”
Daily dosing for ED can be 2.5 mg or increased to 5 mg once daily.
Label Dosage/Administration (Section 2.2): “recommended starting dose… 2.5 mg… may be increased to 5 mg.”
Daily Cialis dosing differs from 'as needed' dosing for ED.
Label distinguishes ED use as needed (Section 2.1) vs once daily use for ED (Section 2.2), including different dose starting points and timing language.
Do not take Cialis if you use nitrates (including nitroglycerin and isosorbide medicines).
Label Contraindications (Section 4.1) and Warnings: “Administration of CIALIS… organic nitrate… is contraindicated… potentiate hypotensive effect of nitrates.”
Combining Cialis with nitrates can cause blood pressure to suddenly drop.
Patient Counseling (Section 17.1): “concomitant use… could cause blood pressure to suddenly drop.”
Tadalafil can lower blood pressure / augment blood-pressure-lowering effects with certain drugs (general concept of BP lowering).
Warnings/Precautions (Section 5.6) and Patient Counseling (Section 17.4): potential for augmentation of blood-pressure-lowering effect; contraindicated nitrates and GC stimulators due to hypotension risk.
People with unstable cardiovascular status/sexual activity inadvisable should not use ED treatments without appropriate medical discussion/clearance.
Warnings (Section 5.1): “should not be used in men for whom sexual activity is inadvisable...”
Clinicians should consider patient cardiovascular/overall risk before use of PDE5 inhibitors for ED.
Warnings (Section 5.1) supports need for inadvisability assessment regarding sexual activity.
Common side effects with once daily use include headache, dyspepsia (indigestion), back pain, myalgia (muscle aches), and nasal congestion (as listed in adverse reactions table excerpts).
Adverse Reactions (Section 6 excerpts/Table 1): “Headache… Dyspepsia… Back pain… Myalgia… Nasal congestion…”
Seek emergency medical attention if an erection lasts more than 4 hours (priapism).
Warnings (Section 5.3) and Patient Counseling (Section 17.6): erection lasting >4 hours/priapism seek emergency attention.
Sudden loss of vision can be a serious risk; stop use and seek medical attention (NAION).
Warnings (Section 5.4): sudden loss of vision may be a sign of NAION; advise stop use and seek medical attention.
Sudden hearing loss can be a serious risk; stop taking PDE5 inhibitors and seek medical attention.
Warnings (Section 5.5): “Physicians should advise patients to stop taking PDE5 inhibitors…”.
Alcohol: substantial consumption with CIALIS can increase potential for orthostatic signs/symptoms (e.g., dizziness).
Warnings (Section 5.9) and Patient Counseling (Section 17.9): substantial alcohol can increase potential for orthostatic signs/symptoms.
Cialis should not be used with riociguat (a GC stimulator).
Contraindications (Section 4.3): “Do not use CIALIS… GC stimulator, such as riociguat.”
Cialis with alpha-blockers: caution regarding additive blood-pressure lowering; patients should be stable and start at lowest recommended dose for ED.
Warnings (Section 5.6) and alpha-blocker initiation/stability language; Dosage/Administration (Section 2.7 excerpt): “patients should be stable… initiate at the lowest recommended dose.”
Cialis should not be used with alpha-blockers for BPH.
Dosage/Administration (Section 2.7, alpha-blockers for BPH): “CIALIS is not recommended for use in combination with alpha-blockers… for treatment of BPH.”
People with significant hepatic impairment: severe hepatic impairment use is not recommended; mild/moderate has dosing limits.
Use in Specific Populations excerpt (Section 2.6) and Warnings/Precautions (Section 5.8): severe use not recommended; dose limits in mild/moderate.
People with severe renal impairment: ED once daily use is not recommended when creatinine clearance <30 mL/min; dose limits apply.
Use in Specific Populations (Section 2.6) and Warnings/Precautions (Section 5.7): “CIALIS for once daily use is not recommended…” and dose limitations elsewhere.
Unsupported Statements
Do not take Cialis with recreational amyl nitrite/amyl nitrate (“poppers”).
The provided excerpts do not explicitly mention 'amyl nitrite/amyl nitrate' or 'poppers' by name. Only general nitrates are contraindicated.
Daily Cialis can interact with some antifungals.
The provided excerpts reference CYP3A4 inhibitors generally, but do not specifically support 'some antifungals' as a labeled class statement.
Daily Cialis can interact with some antibiotics.
The provided excerpts do not specifically support 'some antibiotics' as named interaction examples.
Daily Cialis can interact with certain HIV medicines.
The provided excerpts do not specifically support 'certain HIV medicines' as named interaction examples.
Contradictions
Low
AI Statement
Alcohol can increase dizziness or lower blood pressure when taking daily Cialis.
Label Reference
Warnings/Precautions (Section 5.9) and Patient Counseling (Section 17.9) state increased potential for orthostatic signs/symptoms with substantial alcohol; the excerpts do not explicitly claim 'lower blood pressure' as a direct label phrase.
Important Omissions
The label includes specific guidance that nitrates require time interval separation after last dose (e.g., “at least 48 hours should elapse after the last dose”)—this is not stated in the AI claims provided.
Importance:
Moderate
Safety Assessment
Potential Patient Risk:
Moderate
Several safety-critical areas are correctly reflected (nitrate contraindication, GC stimulator contraindication, priapism, sudden vision/hearing loss, and alpha-blocker precautions). However, interaction claims referencing 'poppers' and specific drug classes (antifungals/antibiotics/HIV medicines) are not explicitly supported by the provided excerpts, which could lead to overconfidence about which agents are involved and missing time-interval counseling for nitrates.
Regulatory Assessment
| On Label |
No |
| Off-label Discussion |
No |
| Promotes Unapproved Use |
No |
| Hallucination Risk |
Moderate |
Recommendation
Mostly Aligned
Primary Issue
Some interaction statements are not explicitly supported by the provided label excerpts (e.g., 'poppers' by name; antifungals/antibiotics/HIV medicines). One safety statement slightly over-specificifies alcohol effects as 'lower blood pressure' rather than the label's orthostatic signs/symptoms phrasing; and nitrate time-interval guidance is omitted.
Suggested Improvement
Rephrase unsupported interaction examples to match label wording (e.g., refer to 'nitrates in any form' and general CYP3A4 inhibitor effects without listing specific antifungal/antibiotic/HIV agents unless supported by provided label text). Add the label’s nitrate separation time interval language if citing nitrate counseling. Keep alcohol counseling aligned to 'orthostatic signs and symptoms' rather than asserting 'lower blood pressure' directly unless the label excerpt uses that exact phrasing.