Effervescent Tablet Shelf Life: The Date a Brand Can Print and What Limits It

Do effervescent tablets expire?

Yes, in the sense that a packed effervescent tablet sold in the EU carries a date. EU food-information law lists the date of minimum durability among the mandatory particulars of prepacked food (Regulation (EU) No 1169/2011, Article 9(1)(f)). Article 2(2)(r) defines it as the date until which the food retains its specific properties when properly stored. Your importer confirms the date rules of the country of sale.

For an effervescent tablet, proper storage means keeping water away. An acid and a bicarbonate lie pressed together as a dry tablet, and water lets them react. In 2003, H. Stahl wrote on effervescent manufacturing in Pharmaceutical Technology Europe. Stahl describes the primary material of effervescents as relatively hygroscopic, which means it absorbs moisture from the air. Stahl notes that this moisture initiates the effervescent reaction. The date on the tube therefore depends on how long the tablets stay dry in their pack, and on the formula itself. The next sections show both.

What shelf life can a brand print on effervescent tablets?

A brand prints the shelf life that the CoA of its batch confirms. FIZZPHARMA's standard for effervescent tablets in tubes is 24 months. That figure is the starting point for planning stock. The figure for your formula is the one stated on the CoA of your batch. It can differ from the standard.

Take the printed date from the CoA, not from a round number chosen for the shelf. Your importer and your distributor read the CoA. A date that matches it keeps the label and the file consistent.

What limits the shelf life of an effervescent tablet?

Three things set the date: the moisture that reaches the tablet, the least stable ingredient in the formula, and the pack that stands between the two. Moisture is the outside threat. The ingredient is the inside one. The tube with its desiccant cap is the pack FIZZPHARMA supplies with the tablet.

1. Moisture. Stahl (2003) gives a typical figure for pharmaceutical effervescents: less than 0.3 % water for long-term storage, against about 2 % for traditional tablets. It is a reference figure from the literature. The date for your batch is the one on its CoA. Pressing the powder into a tablet also reduces its surface, so the tablet takes up moisture from the air more slowly. The pack then has to carry the rest of the job.
2. The least stable ingredient. A formula is a list of ingredients, and each ages at its own pace. The one that changes first fixes the date. Two formulas in identical tubes can therefore carry different dates. A change to an approved formula means a new sample, so plan against the date of the formula you approved.
3. The pack. FIZZPHARMA packs effervescent tablets in a plastic tube whose cap holds a desiccant, because the formula reacts with moisture. The tube and its cap have a page of their own: what keeps an effervescent tablet stable.

How long do effervescent tablets last after opening the tube?

The date on the tube counts for the closed pack. For an opened pack, Article 25(2) of Regulation (EU) No 1169/2011 asks for storage conditions and/or a time limit for consumption to be indicated "where appropriate". Whether your tablet needs a time limit, and its wording, are decisions for your label, made in the artwork you approve.

A tube is opened every time a tablet is taken. Stahl (2003) describes what this does to a tube of ten or more tablets. Moist room air enters at each opening. For that reason, silica gel or other drying agents are built into most tube lids. FIZZPHARMA's tube holds 20 tablets and closes with a desiccant cap.

An in-use line also takes room on the label. The mandatory particulars must be printed with an x-height of at least 1.2 mm. Where the largest surface of the package is under 80 cm², at least 0.9 mm is enough (Article 13(2) and (3)). FIZZPHARMA lays out the date, the storage line and your brand on the tube together, and you approve the artwork before printing.

Best before or use by on effervescent tablets?

"Best before", or "Best before end" when the date shows no day. Article 24(1) keeps the "use by" date for foods that meet two tests. They are highly perishable from a microbiological point of view. They are also likely, after a short period, to be an immediate danger to human health. Read against that text, a dry pressed tablet is not such a food, so the date of minimum durability applies. Your importer confirms the category for the market.

Annex X of the same regulation sets the form of the date. The length of the shelf life decides how much of the date is sufficient.

At the 24-month standard, a tablet falls in the last row: the regulation accepts the year alone, worded "Best before end". A brand that wants distributors to rotate stock by month can print the month and year, also worded "Best before end". Your importer confirms the form that the country of sale expects. Where the product needs special storage, the date is followed by a description of the storage conditions (Annex X, point 1(b)).

Who is responsible for the date on a private label pack?

The brand named on the pack, in the EU reading of the rules. Article 8(1) of Regulation (EU) No 1169/2011 makes one operator responsible for the food information. That is the operator under whose name or business name the food is marketed. If that operator is not established in the Union, it is the importer. Article 8(2) asks that operator to ensure the information is present and accurate.

On a private label pack the name is yours, so the responsible operator reads as you or your importer. Your importer confirms this for the country of sale. FIZZPHARMA designs the artwork or checks yours, and prints it on the tube at the factory. Nothing is printed before you approve it. The batch is made to the approved sample and label, with the CoA that supports the date. What this asks of you is a sign-off. The date wording is part of the artwork you approve, so read it against the CoA before you sign.

How much of the shelf life reaches the shelf?

Less than the figure on the CoA, because dispatch, transit and customs consume part of it before the goods reach a shelf. Plan the run backwards from the date of sale, and subtract the months of the route from the months on the CoA:

Production of tablets and sachets takes from 4 weeks. Transport and customs are added on top of that. The delivery term is EXW unless FCA or DAP is agreed. Under DAP the goods arrive at your address and the duties are yours. Ask your importer or distributor whether the market sets a minimum remaining shelf life on arrival. Put the answer in your brief, so the run and the route fit together.

What shelf life do sachets, drink cubes and sweeteners have?

Powder sachets follow the same 24-month standard as the tube, and the CoA of each batch confirms it. For drink cubes and table-top sweeteners, FIZZPHARMA states the shelf life in its reply to your enquiry.

A sachet is opened for one dose. A cube is opened when it is used. Neither carries the partly used pack that a tube of 20 does. To compare the tube, the cube and the sachet on one page, open effervescent formats.

Which document proves the shelf life to an importer?

The CoA of the batch. Every FIZZPHARMA batch ships with a Certificate of Analysis and a specification after laboratory control. For tablets and sachets, the CoA confirms the shelf life. Your importer holds the product registration in the country of sale. FIZZPHARMA supplies the specification and the CoA for it, so the date on your pack and the CoA need to match.

If an importer or a retail buyer asks for more evidence behind a date, put the request in the brief. The FIZZPHARMA reply states which papers travel with the batch. Clients can also visit the factory and audit it, which is normal practice. The papers are listed on certificates and CoA.

What does your situation decide about the date?

Five situations change how you use the date, and each has a cost. Match your own case to one of them before you fix the run size and the artwork. The date you can sell against differs from the date you print.

1. A long route to market. Count the months of dispatch, transit and customs first. The cost is a shorter selling window than the figure on the CoA. Size the first run to what you can sell inside it. The minimum for tablets is low and counted in tubes.
2. A slow-selling formula. Reorder in steps, not in one large run. The cost is more orders over the year, and a repeat order carries the same minimum as the first.
3. A formula of your own. The date belongs to the formula you approved. The cost is a sample stage before production, and a new sample for any change after approval.
4. A market with date rules of its own. Your importer confirms the form of the date, and the artwork follows it. The cost is a round of artwork if the form differs from your first draft.
5. Warm or humid storage on the route. Name the climate of the route and of the warehouse in the brief, so the FIZZPHARMA reply can address it. The cost is one more line in the brief at the start.

Frequently asked questions

Read more

• The tube, the desiccant cap and moisture: what keeps an effervescent tablet stable
• Tablets of 4 g in tubes of 20: effervescent tablets in tubes
• Sachets of 4–12 g: powder sachets for private label
• Each cube in its own blister: drink cubes for private label
• Tube, cube and sachet side by side: effervescent formats
• Batch papers: certificates and CoA
• Units and lead times: minimum order and lead time
• Category and label rules for a drink tablet: effervescent drinks and cubes in the EU: food or food supplement
• The six steps of an order: how a private label order works

Send the formula, the format and the country of sale through the contact page; FIZZPHARMA replies within 24 hours, Monday to Friday.