4-Day Sacred Medicines retreats

With Ayahuasca, San Pedro, Bufo Alvarius, Kambo & more.

In Playa Del Carmen, Mexico. Ozen Retreat Centre

22-25 Sept —  26-29 Sept
30 Sept/03 Oct — 04-07 Oct 2023

Led by International Facilitator Frédéric Cherri.

*Use the tabs below to find out all details*


A series of immersive 4-day/3-night, all-inclusive (accommodation, ceremonies and meals) retreats in the jungle of Playa del Carmen, Mexico.

‘Entheogens: A Human Odyssey™’ is a revolutionary series of themed Entheogen journeys. This new SpiritRivers offering has been curated to help you harness the transformative power of Entheogens, within a traditional ceremonial context, and to live a better and empowered life. Our vision is to foster thriving communities centred around the Sacred Medicines of the Americas, and to support their mission to help and accompany the ultimate Human Journey.

These elaborate retreats bring together a variety of powerful ancestral medicines, presented and served by an entheogen expert with extensive training in the art of preparing, serving and integrating the experience. We will help you identify from 7 transformative topics to bring to your retreat: growth & freedom, empowerment, integration, spirituality, love and compassion, community and purpose. 

For first timers and adepts alike, it provides a better understanding of how these teaching medicines work, their healing powers and how they pollinate and enhance one another. Each retreat offers a safe introduction to the magic of sacred medicines with a total of 5 ceremonies. All in a traditional approach and in a comfortable retreat center.


The fee for each 4-day retreat is $1390 per person and includes all ceremonies and shamanic processes, accommodation, and delicious vegan meals.

Booking process

To lock your place in one of these retreats, use the button below to select your dates and pay your deposit. You will then automatically receive a 15-page INFO-PACK, an orientation document that will help you prepare, set your intentions, bring items, follow a diet and many other aspects of working with medications. ancestral.

Arrival & departure

Please review our itinerary and, as a courtesy to all, make sure to arrive on site on day one before 4pm.

Venue, Accommodation and Meals

These retreats are hosted at an outstanding venue, set in the abundant jungle of the Riviera Maya. Accommodation is a private studio with your own shower and toilet, massive pool and alfresco delicious vegetarian menus compatible with ancestral medicines.


To lock your place on this retreat, a non-refundable deposit payment of $USD700  is required. Payment options: by Credit Card Visa, MasterCard, American Express, Discover, JCB, Diner’s Club and EnRoute. with any questions by email in English, French or Spanish.

Balance payment to be paid in cash, on-site, at the start of the retreat.

For all enquiries, contact Whatsapp at +52 998 354 2178 or email at f@spiritrivers.com


The Earth Medicines we will work with

Huachuma (San Pedro cactus)

Because it is a bit gentler than many of the other plant teachers, Huachuma has earned the nickname “The Grandfather” around the medicine community — Make no mistake though, San Pedro can produce as deep visions as any other entheogenic, Ayahuasca, Buffo Alvarius or Psilocybin mushrooms. However it is overall less intimidating, less jarring and more loving than many other plant teachers. — His main personality is two-fold: heart-opener...

Ayahuasca (Amazonian brew)

The Grandmother Ayahuasca is certainly to be respected as its strong spirit unfolds our minds and hearts to other realities and otherworldly experiences. It is a bright and convoluted teaching that will take you on a radiant journey. The teaching is also focused on the powers of the Intangible, it's residing spirits and the alliances we can make within those realms. The mission and personality of Ayahuasca is to educate and broaden our perception, to reform old limiting patterns, to ...

Bufo Alvarius (Mexican Toad)

Sapo (Bufo Alvarius) is the master of non-duality. It will show you what holds the cosmos. With practice it will also lead you to realise the mystical yet revealing link there is between the 'void' and it's purpose for our dayly-living. The experience of non-duality is counter-intuitively very practical as it allows us to live from the source, free from the hindrances of mundanity...

Kambo (Amazonian tree frog)

Kambocito, Kampu or Kambo has the propeties to reset your entire Immune system. It is very useful in our current times. It will also help you recode DNA. It works beautifully in preparation or as an adjuvent of other medicines. It's use is to be approached with respect, and trust in your Practitioner is paramount... We currently offer Kambo in almost all our retreats as it...

Rapéh — Sacred Tobacco snuff

Rapé is a fine, light-colored powder containing tobacco and other medicinal and sacred plants, including tree bark ashes, leaves, seeds, and various herbs. Once collected, the components are pulverized with a pestle and filtered, The result is a fine powder blown into the nose.
Rapé brings you into a state of acute attention and awareness. The mind becomes calmer, negativity clears and emotional tensions are released. Participants often feel more grounded during the experience, allowing them to clear up confusions...

Our Itinerary 

Please make sure, by courtesy for all, that you arrive on time on the day andno later than 4pm. Thanks in advance 

Day 1

4pm: Arrival
5pm: Opening Ceremony & Preparation
7pm: Dinner

Day 2

8am: Herbal teas
9-4pm: San Pedro ceremony
4pm: Snacks
7pm: Dinner

Day 3

7am: Teas
8am: Kambo cleanse
10am: Integration
12pm: Brunch
2-7pm: Rest
8pm-2am: Ayahuasca
2am: Rest

Day 4

10am: Light collation
10.30-2pm: Bufo Alvarius
2pm: Integration & Lunch
4pm: Departure

Pricing & Booking

The price for each 4-day retreat is $1390USD per person, all inclusive, ceremonies, accommodation and vegetarian meals. To secure your place, simply pay a non-refundable deposit of US$700 using the payment methods below.

What’s included

Board, meals, all shamanic ceremonies and processes.

What’s not included

Airfare and transportation costs from the airport to the retreat center are not included.


Use online payment below by credit card (Visa, MasterCard, American Express, Discover, JCB, Diner’s Club and EnRoute). The balance must be paid on site on the day of arrival.
If you have any questions, contact us by email in English, French or Spanish.

A stunning and purpose built environment in the jungle close to Playa del Carmen. 

Each participant will have their own private studio with shower and toilet. Pool, alfresco delicious vegetarian dinning included in our fee. 

Who we are —  The team

Your guide on the journey, Frédéric Cherri

By nature, I’m not very fond of labels or titles. However, if I had to describe my path I would say that I’m mostly a practitioner of the shamanic arts, a therapist with 30yrs of clinical practice and tutoring in the field of cranial osteopathy, specialising in trauma, immune disorders and perinatal issues. I’ve also trained extensively for the last 25 years in the shamanic arts, and dedicated much of my time to living and studying with indigenous communities in many parts of the world.

I’m finally an entrepreneur, a retreat leader, a program teacher, a ceremonialist, a shamanic practitioner, an entheogen integration specialist and a personal coach. Years of study and practice on the path of workshop facilitation, field research and clinical & therapeutic work have led me to believe we can heal anything.

I’m also aware of being a bit of an ‘oddball’ in the realm of ancestral medicines, as I’ve trained (and keep training) in a variety of medicines and within different traditions. A medicine man or woman is usually a one-medicine specialist and trains in one sole tradition. I have answered the specific calls from some of these remarkable medicines and travelled wide and far to different jungles and mountains to work and study with varied first-people communities on this planet.

I believe there is a need for people like me to help bridge, protect and disseminate to a western audience the extraordinary wisdom of the first nations who share these medicines. Shamanic work and one of its mysterious and exciting aspects, the realm of plant or earth medicine, brings many answers to the unresolved issues of modern medicine or psychology. I have dedicated my life to supporting others’ journeys, growth, and transformation and am delighted to answer any questions via Zoom or WhatsApp chat. Schedule a free call here. Or leave me a message on WhatsApp at +52 998 354 2178

Support and assisting team

Rogelio Kuntur Cristal

Ceremony Assistant, Nutrition Specialist

For over 20 years, Rogelio has worked in different areas and fields, always in service of love, healing and creativity, and active in supporting and creating transformational and evolutionary spaces.
Having refined his offering in one of his main passions: vegan, gluten-free and sugar-free nutrition, he also learned how to support people in their healing processes. He now finds himself serving within the ceremony space, practising compassion and presence, as well as deepening his understanding of the plant medicine realm.

Amy Lynn Allen

Facilitation support

Amy Lynn is a Shamanic doula, assisting Soulful transformation; the cycle of birth, death, and a guide to one’s own innate possibility, potential, awareness and wisdom. Focused on holistic healing, personal growth, and Spiritual transformation

She is dedicated to awakening the power of co-creative perception by inspiring a new collective vision and possibility, reconnecting with Earth, spirit and community .

Geovanna Arias
Operations & Management

Geovanna is a passionate advocate for natural and holistic healing, plant medicines as powerful tools in helping others work through trauma, depression, anxiety, and pain. She's joined many retreats with Frederic and gained hands-on experience with Huachuma, Ayahuasca, Bufo, Peyote and Kambo. Following her move to Mexico in 2022, she set out to continue helping others find healing and transformation with entheogens and as a way of inspiring growth and positivity in this world.

Ray Bueno
Logistics, Ceremony Assistant

Ray Bueno is a Marine combat veteran and marketing and logistics manager for SpiritRivers International. After struggling with PTSD and depression, he answered the call to a plant medicine retreat in Mexico with Frédéric. Since, he has been passionate about learning more about plant medicine and its potential to heal individuals and communities. He is an advocate for veterans and believes that plant medicines can be a powerful tool in helping veterans suffering from PTSD, chronic pain, and other conditions.