Sildenafil citrate for the management of fetal growth restriction and oligohydramnios

We mainly focused on the effect of sildenafil on EM. All references were scanned from identified articles for additional relevant information. After all the data had been extracted, a table was constructed with respect to first author, study design, patient settings, study groups, outcomes, and conclusion [Table 1]. In one observational study, administration of vaginal sildenafil for 5 weeks improved EM in women with a history of recurrent miscarriage.

• Sildenafil citrate is a phosphodiesterase type 5 inhibitor.
• It may help women with sexual arousal disorder by increasing blood flow.
• Discuss mental health factors affecting libido with a healthcare specialist.
• Be aware of possible nasal congestion after taking sildenafil.
• Avoid using expired medication, as effectiveness may diminish.
• The effectiveness varies among women; results are individual.
• Use sildenafil responsibly to minimize potential adverse effects.
• Women should inform providers of all medications taken regularly.
• Sildenafil is not a cure for sexual dysfunction, only a symptomatic aid.
• Adequate sexual education can improve understanding and expectations.
• Proper dosage and timing are important for safety and efficacy.
• Sex therapy or counseling may complement medication use effectively.

[27] Many observational groups also found that administration of vaginal sildenafil up to 10 days improved EM in 70% of the women with at least two consecutive prior in vitro fertilization (IVF) failures attributed to inadequate endometrial development.

What should I do if I forget a dose?

[8] Estrogen regulates the proliferative phase and estrogen-primed endometrium produces progesterone receptors, which are necessary for the secretory phase endometrial growth regulated by progesterone. Thin endometrium can be due to various reasons, mainly surgical procedures such as cervical dilation and curettage (D and C), radiotherapy, recurrent infections, congenital Müllerian anomalies, and use of clomiphene citrate. [9] The D and C leads to intrauterine adhesions (IUAs), and the Asherman syndrome is a severe degree of IUA. Patients who receive radiotherapy below the diaphragm are more vulnerable. Radiotherapy can lead to disruption of uterine blood vasculature and reduced uterine size.

Cialis Soft Tabs

Chronic endometritis reduced endometrial receptivity and altered uterine contractility leading to infertility. [10] It can be due to various reasons such as infections due to tuberculosis or chlamydia or intrauterine devices. Clomiphene citrate used for ovulation induction can lead to thin endometrium because of its luteal phase defect (antiestrogenic effect on endometrium), which reduces the chances of implantation. A previous study has reported that a thin endometrium is characterized by high blood flow impedance of uterine radial artery, poor epithelial growth, decreased expression of VEGF, and poor vascular development. Hence, adjuvant medications causing vasodilation have been suggested to be beneficial in women with thin endometrium. Among them, implantation and ongoing pregnancy rates were 29% and 45%, respectively. In another study, vaginal sildenafil as well as oral estrogen was administered only in a luteal phase up to 11 days.

Brand/Generic	Price Range ($)	Details
Generic Sildenafil	10-20 per 30 tablets	Most affordable
Brand Name (e.g., Viagra)	50-80 per 30 tablets	Brand premium factors
Online Pharmacies	Varies	Sometimes lower prices, ensure legality
Insurance Coverage	Limited or none	Depends on country and policy

Sildenafil was administered vaginally at a dosage of 25 mg, once a day, showed beneficial impact on the uterine receptivity.

Medication Type	Interaction Effect	Advice
Nitrates	Dangerous drop in blood pressure	Do not use together
Alpha-blockers	Increased hypotension	Consult doctor before combining
CYP3A4 inhibitors	Increased sildenafil levels	Dose adjustment needed
Other PDE5 inhibitors	Potential overdosage	Avoid combining

[25] Sher and Fisch evaluated the effect of sildenafil vaginal suppository, on endometrial development in 4 women who had a history of failed 3 artificial reproductive techniques cycles with good ovarian stimulation and thin endometrium (<8 mm). Doppler studies revealed a decreased pulsatility index with sildenafil use, and in 3 of the 4 women, a significantly thicker endometrium was achieved with the addition of sildenafil.

• Sildenafil citrate tablets should be taken with water, not with food.
• Always follow the healthcare provider’s dosage instructions precisely.
• Use sildenafil only under medical supervision if you have health issues.
• Patients should start with lowest effective doses to assess response.
• Report any signs of allergic reactions like rash or swelling immediately.
• Regular check-ups can monitor for any cardiovascular changes.
• Always verify the legitimacy of the medication source.
• Sildenafil may cause hypotension in susceptible women.
• Consider lifestyle modifications to enhance sexual health benefits.
• The drug's effects typically last 4-6 hours.
• Be cautious of counterfeit sildenafil products available online.
• Educate yourself on potential drug interactions before use.

In a recent comparative prospective study,[23] they compared the effect of vaginal sildenafil citrate and estradiol valerate on EM, blood flow, and pregnancy rates in primary or secondary infertility women undergoing intrauterine insemination (IUI).

Product	Dosage	Quantity + Bonus	Price
Viagra Generic	100mg	60 + 4 Pills	96.36€ 91.77€	Buy
Kamagra	100mg	12 Pills	55.64€ 52.99€	Buy
Viagra Generic	100mg	10 Pills	28.91€ 27.53€	Buy
Kamagra Soft Tabs	100mg	20 Pills	79.79€ 75.99€	Buy
Viagra Generic	200mg	120 + 8 Pills	204.80€ 195.05€	Buy
Viagra Generic	25mg	180 + 6 Pills	154.93€ 147.55€	Buy
Kamagra Soft Tabs	100mg	272 + 12 Pills	593.42€ 565.16€	Buy
Kamagra Soft Tabs	100mg	180 + 8 Pills	425.45€ 405.19€	Buy
Viagra Generic	200mg	30 + 2 Pills	83.07€ 79.11€	Buy
Kamagra Polo	100mg	120 + 6 Pills	327.15€ 311.57€	Buy
Kamagra	100mg	360 + 6 Pills	839.95€ 799.95€	Buy
Viagra Generic	150mg	20 Pills	55.02€ 52.40€	Buy
Kamagra Polo	100mg	12 Pills	60.21€ 57.34€	Buy

Patients were evaluated by transvaginal sonography on day 13th of cycle for EM and pattern with number and size of sildenafil 20 mg prescription Graafian follicle.

• Female-specific studies on sildenafil show mixed results.
• Sildenafil is sometimes used off-label for female libido enhancement.
• Always check for allergies before taking sildenafil citrate tablets.
• Sildenafil may cause vision disturbances in some women.
• Proper hydration can reduce side effects when using sildenafil.
• Combining sildenafil with alcohol can increase risks.
• Be aware of potential interactions with hormonal contraceptives.
• Do not share sildenafil tablets to prevent misuse or overdose.
• Women should report any adverse reactions to their healthcare provider.
• Sildenafil may help with certain conditions like Female Sexual Arousal Disorder.
• Cost of sildenafil for women varies, and insurance may not cover it.
• Follow prescribed instructions precisely to avoid overdose.

Sildenafil significantly increased the endometrial blood flow in comparison to estradiol valerate. The EM and trilaminar pattern of endometrium were comparable in both groups. Sildenafil marginally increased pregnancy outcome in patients undergoing IUI.

• Sildenafil citrate can be prescribed off-label for female sexual dysfunction.
• Consult a doctor before using sildenafil citrate tablets for women.
• Side effects in women may include headache, flushing, or nasal congestion.
• Sildenafil works by increasing blood flow to enhance female arousal.
• Dosage for women varies; always follow medical advice.
• Sildenafil tablets may interact with other medications, like nitrates.
• Not approved by FDA specifically for female sexual dysfunction.
• Use with caution in women with heart conditions or high blood pressure.
• Possible benefits include improved libido and vaginal blood flow.
• Sildenafil should be taken on an empty stomach for best results.
• Long-term safety of sildenafil in women is not well established.
• Store sildenafil citrate tablets in a cool, dry place out of children’s reach.

Sildenafil acts as a specific PDE-5 inhibitor, hence augments the vasodilatory effects of nitric oxide by preventing the degradation of cGMP, which leads to increase uterine blood flow and thicker endometrium.

Mechanism of Action of Sildenafil on Endometrium

The drug was patented in 1996; On March 27, 1998, the Food and Drug Administration approved sildenafil citrate for the treatment of ED. Sildenafil citrate (marketed as Viagra) is sildenafil 130mg manufactured by Pfizer Pharmaceuticals, New York, became the first oral drug available for ED. Nitric oxide causes smooth muscle relaxation by generating intracellular cyclic guanosine monophosphate (cGMP) by stimulating the enzyme guanylate cyclase. cGMP promotes dephosphorylation of myosin light chain kinase, thereby interfering with myosin interaction with actin, leading to smooth muscle relaxation and increase in blood flow. [19] Sildenafil being a selective PDE5 isoenzyme inhibitor enhances the effect of nitric oxide by inhibiting PDE5, which is responsible for degradation of cGMP [Figure 1].

Viagra Soft Tabs

[20] Nitric oxide synthase isoforms have been identified in the vascular muscles of both human endometrium and myometrium. [21] With the use of sildenafil, cGMP remains elevated, which leads to vascular relaxation and increased blood flow to the endometrium. Clinical trials have shown that sildenafil is not useful in angina pectoris because of its many adverse drug reactions. Adverse effects of sildenafil are mainly related to the vasodilation caused by PDE-5 enzyme inhibition. [22] It causes headache, nasal congestion, dizziness, facial flushing, hypotension, and loose motions. [7] Alternatively, another study suggested that sildenafil may have an effect on vasoactive cytokines that regulate endometrial development or implantation. They found that sildenafil increases uterine receptivity by the development of spiral arteries and increasing uterine arterial blood flow.

Statistical Analysis

The endometrial growth is reliant on the uterine blood flow and angiogenesis. [2] Uterine blood flow is closely related with the vascular development of endometrium. Basal one-third layer is supplied by small, straight, and short arteries and superficial two-third of endometrium is supplied by coiled arteries, branch of uterine artery. [3] The average EM is about 8-10 mm in the secretory phase. Angiogenesis plays a significant role in the development of a dominant follicle, formation of a corpus luteum, and growth of endometrium.

Revatio Injection

[4] Angiogenesis is essential to support endometrial growth after menstruation and to provide a vascularized receptive endometrium for implantation. Endometrial growth is regulated by the hormones (estrogen and progesterone) and growth factors such as vascular endothelial growth factor (VEGF). [6] Some of these factors are produced locally and act via paracrine mechanisms; others have to be transferred to the endometrium. Sufficient uterine blood supply is required for these factors to reach the endometrium, especially to its functional layer. [7] Estrogen-induced endometrial proliferation after menstruation is mainly dependent on blood flow to the basal endometrium. [21] They recommended the routine use of oral sildenafil citrate in patients with a previous failure of assisted reproduction technology cycles due to poor EM. Two small cohort studies denoted that the use of vaginal sildenafil improved uterine artery blood flow and sonographic endometrial appearance.

Aspect	Details	Notes
Active Ingredient	Sildenafil Citrate	PDE5 inhibitor
Common Use	Female Sexual Arousal	Under Medical Supervision
Age Group	Adults (18+)	Not recommended for minors
Approval Status	Varies by country	Often off-label use

[2629] Sildenafil was reported to augment baseline and estrogen-induced uterine blood flow in surgically menopausal ovine model. [30] Another effect of sildenafil has been described in women with recurrent miscarriages; it has shown to reduce natural killer cell activity in addition to the endometrial growth facilitating effect. [27] VEGF, produced by the epithelial cells, contributes to angiogenesis and increased vascular permeability in the mid-secretory phase, which is necessary for successful implantation, VEGF expression is highest in the mid-secretory phase. A study showed the VEGF protein expression analyzed by Western blotting was significantly lower in the thin endometrium group than that in the normal-thickness endometrium group.

How should this medicine be used?

Few cases of sudden loss of vision due to nonarteritic ischemic optic neuropathy are recorded. Sildenafil potentiates the vasodilation effect of nitrates, results in fall in BP and myocardial infarction. Therefore, it is contraindicated in patients of coronary heart disease, and caution is advised in the presence of liver or kidney disease, peptic ulcer, and bleeding disorders. It can predispose to priapism in patients with leukemia, sickle cell anemia, and myeloma. A search was conducted using PUBMED, SCOPUS, and COCHRANE database and focused on peer-reviewed, randomized controlled trials, and observational studies using the keywords: "Sildenafil," "endometrium," "endometrial thickness," "implantation," and "In vitro fertilization" [represented in [Figure 2]. [2] Therefore, low VEGF levels in the thin endometrium due to impaired epithelial layer leads to implantation failure and poor endometrial receptivity. Sildenafil citrate stimulated the angiogenic responses of VEGF. A study failed to demonstrate the beneficial effect of sildenafil on thin endometrium, has been reported in women treated with estrogen and sildenafil citrate.

Literature Search - Role of Sildenafil in Endometrial Thickness

Several agents such as antithrombotic agents, aspirin,[11] and heparin have been evaluated by several groups. Heparin was found to improve pregnancy rates among women with thrombophilia and recurrent abortions. [1314] Sildenafil, a phosphodiesterase 5 (PDE-5) inhibitor is now one of the standard treatments for erectile dysfunction (ED) since decades. [15] Beyond its urological scope, new therapeutic applications are being explored because of its vasodilatory property. Hence, here is an attempt to review the effect of sildenafil on the EM, which increases the pregnancy outcome, i.e.

Red Viagra

its utility in the management of female infertility. Sildenafil (compound UK-92,480) was synthesized by Pfizer scientists Andrew Bell, David Brown, and Nicholas Terrett. It was initially studied for use in hypertension and angina pectoris. The Phase I clinical trials conducted in Morriston Hospital in Swansea suggested the drug had little effect on angina, but it could induce marked penile erections. [16] Following this, Pfizer therefore decided to market it for ED, rather than for angina. Neither vaginal estrogen nor sildenafil significantly improved EM or blood flow in the subsequent frozen embryo transfer (ET) cycle.