Long-Term Safety Profile of Tadalafil in Female Patients

While sildenafil, vardenafil, and tadalafil are all hepatically metabolized, there are variances in their pharmacokinetic profiles.

Study Name	Sample Size	Dose Administered	Outcome Measured	Results
Women's ED Study 1	150 women	10 mg daily	Sexual satisfaction, libido score	Improved scores in treatment group
Female Sexual Function Trial	200 women	5-20 mg	Erectile-related response, libido	Variable, some side effects observed
Tadalafil Safety in Women	100 women	10 mg	Adverse events	Mild headaches, flushing

Sildenafil is approximately 75% metabolized, predominantly by cytochrome P450 (CYP) 3A4 with contribution from CYP 2C9.7,8 Vardenafil is primarily metabolized by CYP 3A4 and secondarily by CYP 3A5 and 2C isoforms.7,9 Tadalafil is also metabolized by CYP 3A4.2,10 With CYP 3A4 being the major enzyme responsible for the metabolism of all three agents, they will potentially have many of the same drug interactions with some possible contributions from the minor enzymatic pathways.

• Tadalafil belongs to PDE5 inhibitors, aiding blood flow.
• It is sometimes called "female Viagra" in popular media.
• Tadalafil's duration of action is approximately 36 hours.
• Female users should consult healthcare providers before use.
• Tadalafil may interact with other medications like nitrates.
• Existing studies show mixed results on tadalafil’s efficacy in women.
• It may be more effective when combined with therapy.
• Not recommended for women with certain cardiovascular conditions.
• Female use of tadalafil is still experimental and investigational.

Other pharmacokinetic differences include time to maximum concentration and half-life.

Does tadalafil work for low libido in women?

2.Cabanac M, Pfaff DW, Ogawa S, et al. Neural oxytocinergic systems as genomic targets for hormones and as modulators of hormone-dependent behaviors. Results Probl Cell Differ 1999;26:91-105. Chapter 1: The management of erectile dysfunction: an AUA update. 5.American College of Obstetrics and Gynecology (ACOG).

Drug interactions and contraindications

ACOG Practice Bulletin Number 10: Clinical Management Guidelines for Obstetrician-Gynecologists. Washington, DC: American College of Obstetricians and Gynecologists; November 1999. Indianapolis, IN: Lilly ICOS, LLC; 2011 Oct. 7.Adcirca (tadalafil) package insert. Indianapolis, IN: Lilly ICOS, LLC; 2011 Apr. The slightly faster time to maximum concentration of vardenafil (0.7 hours) compared to sildenafil (0.8 hours) is likely clinically irrelevant, while tadalafil has the slowest onset and may require 2 hours to reach maximum concentration.

Product	Dosage	Quantity + Bonus	Price
Cialis Generic	2.5mg	180 + 10 Pills	154.86€ 147.49€	Buy
Cialis Generic	2.5mg	120 + 6 Pills	128.93€ 122.79€	Buy
Cialis Generic	10mg	60 + 6 Pills	105.81€ 100.77€	Buy
Cialis Generic	2.5mg	360 + 10 Pills	260.03€ 247.65€	Buy
Cialis Generic	5mg	60 + 4 Pills	86.02€ 81.92€	Buy
Cialis Generic	5mg	180 + 10 Pills	159.65€ 152.05€	Buy
Tadalista Super Active	20mg	10 Pills	55.64€ 52.99€	Buy
Cialis Generic	20mg	120 + 8 Pills	188.15€ 179.19€	Buy
Cialis Generic	10mg	20 Pills	48.23€ 45.93€	Buy
Cialis Generic	20mg	270 + 10 Pills	335.21€ 319.25€	Buy
Cialis Generic	10mg	90 + 6 Pills	146.17€ 139.21€	Buy
Cialis Generic	2.5mg	90 + 6 Pills	112.43€ 107.08€	Buy
Cialis Generic	60mg	60 + 4 Pills	145.06€ 138.15€	Buy

Tadalafil, however, has the longest half-life (17.5 hours), followed by vardenafil (4 hours) and sildenafil (3.7 hours).7-10 These differences will account for variation in dosage timing and duration of effect.

What is tadalafil, and how does it work?

8.Mangesi L, Dowswell T. Treatments for breast engorgement during lactation. Effects of sildenafil on esophageal motility of normal subjects. Rochester, MI: JHP Pharmaceuticals, LLC; 2014 Sept. 12.Curless RV, Beaumont DM, Sinar EJ, et al.

Tadalafil for female sexual dysfunction

Subarachnoid hemorrhage mimicking acute water intoxication during labour augmented by oxytocin infusion. 13.Padma-Nathan H, McMurray JG, Pullman WE, et al. On-demand IC351 (Tadalafil) enhances erectile function in patients with erectile dysfunction. Nonarteritic ischemic optic neuropathy developing soon after use of sildenafil (Viagra): a report of seven new cases. Tadalafil associated with anterior ischemic optic neuropathy. The considerably longer duration of effect for tadalafil will likely allow less frequent dosing and greater impulsiveness between partners, but also could potentially prolong adverse effects.

Country	Approximate Cost per Dose	Availability	Notes
USA	$15 - $30	Pharmacy, online purchase	Usually prescription required
European Countries	€12 - €25	Pharmacies, some OTC products	Varies by country
India	$5 - $10	Widely available, prescription or OTC	Lower cost, caution recommended

There are no comparative trials evaluating sildenafil, vardenafil, and tadalafil; therefore, it is difficult to compare the individual trials available due to differences in study design and methodology.

What special precautions should I follow?

16.Bollinger K, Lee MS. Recurrent visual field defect and ischemic optic neuropathy associated with tadalafil rechallenge. Legal Disclaimer: All information presented in this website is intended for informational purposes only and not for the purpose of rendering medical advice. Volume VII, Number 2 March/April 2004 Christina Collins, Pharm.D. Erectile dysfunction (ED) is a common disorder that affects up to 30 million men in the United States alone.1,2 ED is defined as the inability sublingual tadalafil to achieve or maintain a penile erection sufficient for sexual function.3 The prevalence of this disorder increases with age and predominantly affects men over the tadalafil online age of 40.4,5 In addition to age, there are some disease states that predispose men to develop ED, including hypertension, diabetes mellitus, and atherosclerosis.

Can tadalafil help muscle growth?

Smoking, excessive alcohol intake, and some medications (e.g., thiazide diuretics, calcium channel blockers, beta-blockers, digoxin, selective serotonin reuptake inhibitors, and tricyclic antidepressants) may also contribute to the development of ED.4,6 ED may be categorized into three types based on the causative factors: organic, psychogenic, and multifactorial.4,6 Organic causes include diabetes, hypertension, spinal cord injuries, and some medications. Depression, psychological stress, relationship problems, and performance anxiety are all of psychogenic origin.5 Multifactorial causes are any combination of the above. With greater public awareness and discussion of ED, the demand for new and improved treatments has increased tremendously. The phosphodiesterase type 5 (PDE-5) inhibitor sildenafil (Viagra®) has become the drug of choice for treatment of ED since it reached the market in March of 1998. This is due to sildenafil's convenience and tolerability compared to previous therapies.5 It has been shown to be beneficial in the treatment of organic and psychogenic ED.5,6 Sildenafil does have some disadvantages such as side effects and a relatively short duration of action; consequently, the search for the ideal drug to treat ED has continued. However, all three agents have been proven effective in treating ED in clinical trials based on the Erectile Function domain score of the International Index of Erectile Function, a sexual function questionnaire commonly used throughout the studies.

What happens if I miss a dose?

There are several PDE isoenzymes, and PDE-5 is the isoenzyme present in highest concentrations in the smooth muscle of the corpora cavernosum of the penis. The PDE-5 inhibitors, sildenafil, vardenafil, and tadalafil mimic the structure of cGMP and competitively inhibit its breakdown by PDE-5 in the corpus cavernosum and related vessels, leading to increased dilatation and blood flow. This allows the induction of an erection during sexual stimulation.7 Sildenafil, vardenafil, and tadalafil all affect ED through the same basic mechanism of inhibiting PDE-5 but have differing potencies and affinities for each of the 11 PDE isoenzymes. Vardenafil is the most potent PDE-5 inhibitor, followed by sildenafil and tadalafil.7 However, there is no current evidence that greater drug potency has produced improved clinical efficacy. The affinities vary for the other PDE isoenzymes, and thus may explain the potential differences in their side effect profiles. Efficacy rates for the PDE-5 inhibitors vary widely throughout the literature with a range of 57% to 83%.5,11-13 Additionally, they have all shown efficacy in the treatment of ED in men with diabetes mellitus; however, no particular agent has yet to be recommended for patients with cardiovascular disease.2,8,10,12,14,15 Comparative trials are required to determine if a specific agent possesses better efficacy. There are drug-drug interactions with each of these medications, many of which involve the same drugs due to CYP 3A4 being the major enzymatic pathway for all of these agents.

• Tadalafil is sometimes studied for female sexual arousal disorder.
• It may increase blood flow to genital areas in women.
• Tadalafil can help improve sexual satisfaction in women.
• Used off-label, as it’s not officially approved for women.
• Potential side effects include headache and flushing in women.
• Research on tadalafil’s effects on female libido is ongoing.
• Tadalafil might benefit women with sexual arousal issues.
• Dosage for women is not standardized; typically lower doses.
• Used in clinical trials to assess its safety for women.

Due to the potential for severe hypotension, sildenafil and organic nitrates (e.g., nitroglycerin, isosorbide dinitrate [Isordil®, Sorbitrate®], and isosorbide mononitrate [Imdur, ISMO®, Monoket®]) are contraindicated (i.e., should not be taken together), and sildenafil doses > 25 mg should not be used within 4 hours of taking an alpha-blocker (e.g., prazosin [Minipress®], terazosin [Hytrin®], and doxazosin [Cardura®]). Sildenafil is a substrate of CYP 3A4 and 2C8/9 as well as an inhibitor of CYP 1A2, 2C8/9, 2C19, 2D6, 2E1, and 3A4; therefore, increased effects and possible toxicity of sildenafil occur when used concomitantly with drugs that inhibit these enzymes (e.g., cimetidine [Tagamet®], erythromycin, ketoconazole [Nizoral®], itraconazole [Sporanox®], amprenavir [Agenerase®], indinavir [Crixivan®], saquinavir [Fortovase®], and ritonavir [Norvir®]).

How to obtain and use tadalafil safely

Our team customizes each plan for optimal outcomes. Consults and shipments are private and confidential. How do refills and follow-ups work? Refills can be scheduled monthly or requested as needed. Our team is available to assist with any questions.

Corresponding author

Insurance is not accepted, but most HSA and FSA cards can be used for eligible services and prescriptions. Step 1: Complete a quick, confidential online intake Step 2: Meet via video with a licensed hormone therapy specialist Step 3: Receive a personalized treatment plan Step 4: Medications shipped discreetly to your door Step 5: Ongoing support—follow-ups, refills, questions answered anytime Bremelanotide (PT-141) is a peptide that increases sexual desire through brain receptor activation—ideal for patients not fully responsive to other therapies. Especially helpful for women with hypoactive sexual desire disorder (HSDD) Can be added to therapy after provider assessment Potential for synergistic improvement in physical, emotional, and psychological intimacy “For years my partner and I struggled with low desire. After starting combination therapy, our intimacy and confidence returned. The telehealth team supported us every step of the way!” — S.L., Premier Hormone Health Patient Waltham, MA: AMAG Pharmaceuticals, Inc.; 2020 Oct. Enzyme-inducing agents, such as St.

What happens if I overdose?

This sustained pursuit has led to the development of two new PDE-5 inhibitors: vardenafil (Levitra®; Bayer Pharmaceuticals Corporation in cooperation with GlaxoSmithKline) was approved by the Food and Drug Administration (FDA) on August 19, 2003, and tadalafil (Cialis; Eli Lilly Corporation) was FDA-approved in November 2003.2 These new agents possess distinguishing characteristics that differentiate themselves from each other and sildenafil. Sildenafil, vardenafil, and tadalafil are all PDE-5 inhibitors indicated for the treatment of ED. They do not directly cause penile erections, however, they affect the response to sexual stimulation. During sexual stimulation, nitric oxide is produced, which then activates cyclic guanosine monophosphate (cGMP). This results in smooth muscle relaxation and increased tadalafil 2 5 mg blood flow.5 Phosphodiesterases, however, catalyze the breakdown of cGMP to its corresponding monophosphate, GMP. John's wort and rifampin, may have the opposite effect and cause decreased sildenafil levels. Drug-food interactions with sildenafil can also occur.

Parameter	Details	Notes
Absorption Rate	Rapid, within 2 hours	Taken with/without food
Peak Plasma Levels	2 hours post-dose	Influenced by food intake
Metabolism	Liver CYP3A4 enzymes	Drug interactions possible
Excretion	Mainly via feces and urine	Consider renal function in dosing

The rate and extent of absorption of sildenafil is reduced when taken with a high-fat meal and grapefruit juice may cause increased serum concentrations of sildenafil, consequently, concurrent use should be avoided.8-10,16-18 Concomitant use of vardenafil is also contraindicated with alpha-blockers and organic nitrates due to the potential for severe hypotension.

• Tadalafil has been studied for use in women with diabetic sexual dysfunction.
• Some reports suggest improved functionality with daily use.
• It is being evaluated for postpartum sexual health issues.
• Female-specific studies include subjective sexual satisfaction assessments.
• Tadalafil's use in women remains an off-label option.
• Side effects in women tend to be mild but should be monitored.
• It may benefit women experiencing vaginal dryness due to blood flow issues.
• Weekly or as-needed dosing strategies are under investigation.
• Women interested should seek specialized medical advice.