Nearly every on-demand erectile dysfunction treatment works on a single axis: it inhibits an enzyme to improve blood flow, and that is the whole product. It is an effective approach, and for many men it is enough. But it treats erectile function as a purely mechanical, purely vascular event, and anyone who has experienced ED knows it is rarely that simple. Timing matters. Duration matters. And for a great many men, the single biggest obstacle is not circulation at all. It is what is happening in their head.

CLYR Tempo is built around that fuller picture. It is a compounded orally-dissolving tablet with four active ingredients, each chosen to address a different dimension of the experience: two prescription medications that work on blood flow with different timing, an amino acid that supports the body's own blood-flow chemistry, and a calming compound from green tea aimed at the mental side of performance. The positioning line the product carries, "Harder. Longer. Calmer," is a fair summary of the design intent.

This article explains the science behind each of the four actives, why combining them is mechanistically sensible, and, just as importantly, what the honest limits of the evidence are. Because Tempo is a compounded product rather than an FDA-approved finished drug, being straight about what is proven and what is rationale is not just good ethics, it is the whole point.

The short answer

CLYR Tempo is a compounded, mint-flavored tablet that dissolves under the tongue. It contains four actives: sildenafil and tadalafil (both prescription PDE5 inhibitors), plus citrulline (50mg) and L-theanine (60mg). The two prescription medications address erectile function through the well-established PDE5 pathway, with sildenafil offering faster onset and tadalafil offering longer duration. Citrulline supports the body's own nitric-oxide production, the same biological pathway the prescription actives amplify. L-theanine, the calm-focus compound in green tea, targets the psychological dimension, the performance anxiety that is a common and under-addressed contributor to ED.

The individual ingredients each have real published research behind them, which this article documents. The specific four-active combination, however, has not been studied or approved by the FDA as a finished product. Tempo should be understood as a rational combination of individually-supported ingredients, prescribed after a licensed provider reviews your history, not as a clinically-trialed finished drug.

Why an orally-dissolving tablet

Before the ingredients, a word on the delivery format, because it is part of the design.

CLYR Tempo is an orally-dissolving tablet (ODT): it breaks down in the mouth without water rather than being swallowed whole. ODTs have become popular across medicine for practical reasons that apply directly to on-demand ED treatment. They are discreet (no glass of water, no visible pill-taking), convenient (they can be taken anywhere, at the moment they are wanted), and easy for people who dislike swallowing tablets.

There is also a pharmacological rationale often cited for sublingual and orally-dissolving delivery: a portion of the medication may be absorbed through the mucous membranes of the mouth, which can bypass some of the first-pass metabolism that swallowed drugs undergo in the liver. The extent of this effect varies by drug and formulation and should not be overstated, but the format is a legitimate and increasingly common choice, and for an on-demand product the discretion and convenience alone are meaningful advantages.

The two prescription actives: sildenafil and tadalafil

The core of Tempo is two prescription medications that belong to the same class, PDE5 inhibitors, but have meaningfully different profiles. Understanding why both are included requires understanding how they work and how they differ.

The shared mechanism. Both sildenafil and tadalafil work by inhibiting an enzyme called phosphodiesterase type 5 (PDE5). During sexual arousal, the body releases nitric oxide, which triggers production of a molecule called cGMP that relaxes the smooth muscle in penile blood vessels, allowing them to fill with blood. PDE5 is the enzyme that breaks cGMP down. By inhibiting PDE5, these drugs let cGMP accumulate and persist, supporting a firmer, more reliable erection in response to arousal. Both are among the most-studied and most-prescribed medications in men's health, with decades of established use.

The key difference: timing. This is why Tempo includes both rather than one.

Sildenafil is the faster-acting of the two. It typically reaches peak blood levels in about one hour (often faster on an empty stomach) and has a relatively short half-life of about 3 to 4 hours. It is, in the product's framing, the active "for tonight", relatively quick on, relatively quick off.

Tadalafil is the long-acting counterpart. It has a remarkably long half-life of about 17.5 hours, the longest in its class, which is why on-demand tadalafil is famous for providing a window of effect that can last well over a day. It is the active "for the weekend", slower and steadier, with a much wider window.

Why combine them. The rationale for including both is that their kinetic profiles are complementary: the faster onset associated with sildenafil paired with the longer duration associated with tadalafil. It is worth being precise here, because this is a compounded combination, not an FDA-approved co-formulation, and combining two PDE5 inhibitors is exactly the kind of thing that should happen only under a licensed provider's review. That is why every Tempo order is reviewed by a licensed provider against your medical history, and why a combination formula is explicitly not appropriate for everyone. The provider review is not a formality; it is the safeguard that determines whether this product is right for you before anything ships.

The third active: citrulline and the nitric-oxide pathway

The third ingredient, L-citrulline at 50mg, is where Tempo starts working with the body's own chemistry rather than only on the enzyme.

Recall that the whole PDE5 pathway begins with nitric oxide. Citrulline is an amino acid that the body converts, in the kidneys, into L-arginine, which is in turn the direct substrate the body uses to produce nitric oxide. In other words, citrulline supplies raw material to the front end of the very pathway that the prescription actives amplify at the back end.

There is a specific reason citrulline is used rather than arginine directly. As researchers testing it have noted, oral L-arginine is hampered by extensive presystemic metabolism, meaning much of it is broken down before it can raise nitric-oxide levels. L-citrulline escapes that first-pass breakdown and is converted to L-arginine more efficiently, making it a more reliable way to support nitric-oxide production.

And there is real clinical evidence in the ED context specifically. A 2011 single-blind study published in the journal Urology (Cormio et al.) tested oral L-citrulline in men with mild ED. The results: 50% of the men improved their erection hardness score from 3 to 4 while taking citrulline, compared with just 8.3% on placebo, and the mean number of intercourses per month rose from 1.37 to 2.3.

The honest framing matters here, and the study itself provides it. The authors were clear that citrulline is less powerful than PDE5 inhibitors, while also noting it was safe and well accepted by patients. That is exactly the role citrulline plays in Tempo: not the star, but a well-tolerated, mechanistically-sensible supporting ingredient that feeds the front end of the nitric-oxide pathway while the prescription actives work downstream.

The fourth active: L-theanine and the part no one else treats

Here is where CLYR Tempo genuinely differs from a standard ED product, and it is worth dwelling on because it reflects an honest understanding of what actually causes erectile difficulty for many men.

Erectile dysfunction is not always, or even usually, a purely physical problem. Performance anxiety, the anxious, self-monitoring, pressure-filled mental state that can accompany sex, is a well-recognized and extremely common contributor to ED, particularly in younger men and in men whose ED is situational rather than chronic. And here is the cruel irony of it: PDE5 inhibitors do nothing for this. You can have perfect vascular function and still struggle if your mind is caught in an anxiety loop. A product that only addresses blood flow simply leaves this dimension untreated.

L-theanine is Tempo's answer to that gap. It is an amino acid found in green tea, and it has a genuinely unusual and well-documented property: it promotes a state of calm alertness without sedation. It relaxes without making you drowsy or foggy, which is precisely the state you would want.

The research on L-theanine's calming effect is well established. Randomized controlled trials have shown that L-theanine reduces stress and anxiety responses in people under acute stress. A 2007 trial found it reduced both psychological and physiological stress responses during a demanding task, with effects measurable within about 30 minutes. The mechanism is well characterized: L-theanine increases alpha brain-wave activity (the pattern associated with relaxed alertness) and modulates calming neurotransmitter systems including GABA, without binding the sedative receptors that benzodiazepines act on, which is why it calms without dulling.

The honest note: most of that research studied L-theanine for stress and anxiety in general rather than for sexual performance anxiety specifically, and typically at higher doses than a single supporting ingredient provides. So the claim Tempo makes with L-theanine is not that it is a proven treatment for performance anxiety. It is that L-theanine is a well-researched, non-sedating calming compound, included on a sound rationale: that the mental dimension of performance deserves to be addressed rather than ignored. It is the ingredient that reflects the product's core insight, that a good experience is not only about blood flow. As with any calming aid, L-theanine complements rather than replaces care for genuine anxiety.

Why four actives instead of one

Putting the pieces together, the logic of Tempo's formulation is that it maps four ingredients onto four dimensions of the same experience:

The two prescription actives do the primary work through a proven mechanism. The two non-prescription actives are complementary supports: one feeding the same biochemical pathway, one addressing the psychological side. It is a coherent, thoughtfully-constructed combination.

What it is not, and this must stay clear, is an FDA-approved, clinically-trialed finished product. Each ingredient is individually supported by the evidence described above, but the specific four-active tablet has not been studied as a unit. That is the nature of a compounded medication, and it is why the model depends on a licensed provider reviewing your history and confirming this specific combination is appropriate for you.

Who it is for, and who it is not

CLYR Tempo is designed for men who want an on-demand option and who may value the specific things it is built around: the flexibility of both fast and long-acting actives in one tablet, the discretion of a dissolving format, and the attention to the mental side of performance. Men whose ED has a situational or anxiety-linked component may find the L-theanine rationale particularly relevant.

It is not for everyone, and some exclusions are absolute. Nitrates are a hard stop. Combining any PDE5 inhibitor with nitrate medications (nitroglycerin, isosorbide) or recreational "poppers" (amyl nitrite) can cause a dangerous, potentially fatal drop in blood pressure. A recent cardiac event is also a hard stop. Alpha-blockers, significant cardiovascular disease, certain eye conditions, and severe liver or kidney impairment all require careful provider evaluation. This is exactly why every Tempo order is reviewed by a licensed provider before anything ships, and why treatment is declined (with a full refund) when it is not appropriate.

Safety and honest disclosure

CLYR Tempo's prescription actives carry the well-established safety profile of the PDE5 inhibitor class. Common side effects include headache, flushing, nasal congestion, back pain, and indigestion. Seek immediate medical attention for an erection lasting more than four hours (priapism) or for sudden vision or hearing changes.

Because Tempo combines two PDE5 inhibitors, provider oversight is central to using the product safely. And the compounded nature of the product must be stated plainly: this combination has not been FDA-approved as a finished product, and compounded medications are prepared by licensed pharmacies but are not reviewed by the FDA for safety or effectiveness the way a manufactured drug is. Its individual prescription ingredients are FDA-approved medications; the specific combined tablet is not. That honesty is not a disclaimer buried at the bottom, it is part of understanding what you are taking.

How CLYR offers Tempo

CLYR Tempo is available only through CLYR. The process is built around the provider review that a two-PDE5-inhibitor combination requires: you complete a questionnaire covering your symptoms, medical history, and current medications; a licensed provider reviews it and decides whether treatment is appropriate; and if approved, a state-licensed compounding pharmacy prepares the dissolving tablet and ships the full term in plain packaging. If treatment is not appropriate, you receive a full refund.

The pricing is one-time and transparent: the price is shown before the questionnaire, and nothing renews automatically. Questions about dose or side effects can be raised with your provider through the patient portal at no charge. CLYR is LegitScript certified, HIPAA compliant, and works only with licensed providers and state-licensed pharmacies.

Frequently asked questions

What is CLYR Tempo?

A compounded orally-dissolving tablet containing four actives, sildenafil and tadalafil (prescription PDE5 inhibitors), plus citrulline and L-theanine. It dissolves under the tongue, is mint-flavored, and is taken on demand.

Why does it contain two ED medications instead of one?

Sildenafil and tadalafil are both PDE5 inhibitors but with different timing: sildenafil is faster-acting, tadalafil is longer-lasting. Including both is intended to combine quicker onset with a longer window. Because combining two PDE5 inhibitors requires clinical judgment, a licensed provider reviews your history and decides whether the combination is appropriate for you.

What do the citrulline and L-theanine actually do?

Citrulline is an amino acid that supports the body's own nitric-oxide production, the same pathway the prescription actives amplify; a 2011 Urology study found oral citrulline improved erection hardness in men with mild ED, though less powerfully than PDE5 inhibitors. L-theanine is a calming compound from green tea, included to address the mental and performance-anxiety side of the experience that blood-flow medications do not touch.

Is this combination FDA-approved?

No. The individual prescription ingredients (sildenafil and tadalafil) are FDA-approved medications, but the specific four-active combination is a compounded product and has not been FDA-approved as a finished product. Compounded medications are prepared by licensed pharmacies and are not FDA-reviewed for safety or effectiveness.

Who should not take it?

Anyone taking nitrates or with a recent cardiac event should not take it, these are absolute contraindications. People on alpha-blockers or with significant heart disease, certain eye conditions, or severe liver or kidney impairment need provider evaluation. A licensed provider reviews every order and declines it (with a refund) when it is not appropriate.

How is it different from a standard ED pill?

Two ways: it combines a fast-acting and a long-acting PDE5 inhibitor in one tablet rather than using just one, and it adds citrulline and L-theanine to address blood-flow chemistry and the mental side of performance. Most on-demand products address blood flow alone.

The Bottom Line

CLYR Tempo is a thoughtfully-constructed on-demand ED product built on a genuinely different premise: that performance has more than one dimension. Its two prescription PDE5 inhibitors address erectile function through a proven mechanism with complementary timing, its citrulline supports the body's own nitric-oxide chemistry, and its L-theanine reflects an honest recognition that the mental side of performance, the anxiety that blood-flow drugs ignore, is real and worth addressing. Each ingredient is individually backed by published research, which this article has documented and linked.

The honest caveat is equally important: the specific four-active combination is a compounded product, not an FDA-approved finished drug, and its safe use depends on the licensed-provider review that confirms it is appropriate for you. Understood on those terms, honestly and completely, Tempo is one of the more genuinely interesting on-demand options in men's sexual health.

If CLYR Tempo sounds like a fit, the questionnaire is free, the price is shown before you answer a single question, and a licensed provider reviews everything before anything ships. Learn more on the CLYR Tempo product page.

Medical disclaimer

This article is for educational purposes only and does not constitute medical advice, diagnosis, or treatment. CLYR Tempo is a compounded medication containing prescription PDE5 inhibitors (sildenafil and tadalafil); these have serious contraindications, most critically an absolute contraindication with nitrate medications and with alpha-blockers, which can cause life-threatening drops in blood pressure. The individual active ingredients described here are supported by published research, but the specific four-active combination has not been FDA-approved as a finished product, and compounded medications are prepared by licensed pharmacies without FDA review for safety or effectiveness. Citrulline and L-theanine are included as supporting ingredients; the research cited for them reflects studies of those ingredients individually and does not establish the finished combination as a proven treatment. The decision to begin any prescription or compounded medication should be made in consultation with a licensed healthcare provider who knows your full medical history and current medications, and who can determine whether treatment is appropriate. Seek immediate medical attention for an erection lasting more than four hours or for sudden vision or hearing changes. Individual results vary.